Rarely does a rematch for this year's Super Bowl happen for just the 10th time in NFL history when the Kansas City Chiefs meet the Philadelphia Eagles on Sunday, Feb. 9, at 6:30 p.m. ET (FOX) at Caesars Superdome in New Orleans.

And it's even rarer for it to happen so soon after the first fight. This rematch between the Chiefs and Eagles marks the fifth time in Super Bowl history that a rematch has taken place within five seasons of the first meeting, with the winner of the first matchup having a perfect 4-0 record in the rematch.

Many of the key players and coaches from two years ago will meet again in Super Bowl 59, but both sides have also undergone significant changes since their meeting in Super Bowl 57.

Super Bowl rematch between Chiefs and Eagles: What changed in Kansas City?
All of the key pieces from the Chiefs' 38-35 victory over the Eagles in Super Bowl 57 are back for another showdown with Philadelphia ahead of Super Bowl 59.

That includes star quarterback Patrick Mahomes - the favorite for Super Bowl MVP - and his star tight end Travis Kelce, who threw an NFL-record 17 touchdowns in the postseason. Head coach Andy Reid and defensive coordinator Steve Spagnuolo still lead the two-time champions.

But Kansas City, preparing for its second Super Bowl meeting with the Eagles, has a lot of new faces, especially on offense.

Key additions to the Chiefs since Super Bowl 57

Kansas City Chiefs general manager Brett Veach is fortunate to have one of the greatest head coaches in NFL history in Reid and a quarterback in the thick of the Tom Brady/Patrick Mahomes controversy, so he hasn't had to make high-profile acquisitions to stay competitive.

Still, it's not easy to retain talent after winning two straight Super Bowls, and he's managed to do just that by bringing in veterans like Kareem Hunt, Drew Tranquill, DeAndre Hopkins and Hollywood Brown. He also made some high-profile moves, such as signing Jawann Taylor, that may have fallen short but ultimately didn't hurt the team.

However, the most impressive thing Veach and Reid have done since the last Super Bowl against the Eagles are several successful draft picks. As explosive as first-round pick Xavier Worthy was for the team, shopping Chamarri Conner and fourth-round pick Jayden Hicks in consecutive years is how great teams stay dominant. 

It's also a credit to his coaching staff, particularly Spagnuolo and secondary coach David Merritt, for developing the young players selected on Day 3 into impact players. Perhaps the biggest difference between the Chiefs and Eagles was that Kansas City retained staff members like Spagnuolo and Merritt.

Those two, along with special teams coordinator Dave Toub, offensive line coach Andy Heck and defensive line coach Joe Cullen are among the most respected coaches in the NFL. Surprisingly, none of them have been poached for a higher position (or contract).

Chiefs' major losses since Super Bowl 57

The Chiefs have clearly lost several significant players since their last game against the Eagles in the Super Bowl. But as this team has proven time and time again, as long as it has Mahomes, Reid, Spagnuolo, Kelce and Chris Jones, it can survive the loss of even the NFL's most dynamic players. (See: Hill, Tyreek).

Without a doubt, the biggest loss since Super Bowl 57 is L'Jarius Snead, who Kansas City traded to the Titans. Losing a versatile lead cornerback of his caliber would have hurt most teams, but the Chiefs barely felt his loss thanks to their ability to develop secondary players like Trent McDuffie, Conner and Jalen Watson.

With the departures of Frank Clark, Carlos Dunlap and Halen Saunders, Veach has managed to keep the defensive line intact. This is once again a credit to the team and Jones' dominance. Many of the Chiefs' defensive players are locals, and they are growing into useful players like Tershawn Wharton and Mike Danna on the defensive line.

Even the loss of Bieniemy, who transferred to the UC Washington Commanders last year, had little impact. Reid already had a replacement - Matt Nagy was already on staff as QB coach, and Nagy was the head coach of Kansas City before becoming head coach of the Chicago Bears.

Again, when you have a Hall of Fame inducted head coach, QB, quarterback, defensive coordinator and one of the best defensive coordinators of all time, holes are easy to plug. But it's interesting to see how much Kansas City and Philadelphia differ in terms of roster and turnover.

Super Bowl rematch between the Chiefs and Eagles: What changed in Philadelphia?
Like their rivals, the Eagles still have the same head coach, quarterback and general manager that they had when these teams met in Super Bowl 57.

Nick Sirianni and Jalen Hurts are the only head coach and quarterback to have been to two Super Bowls, though both are still in search of their first Lombardi Trophy. They'll have another shot at it, thanks to the work Howie Roseman has done in assembling another NFC Championship-winning squad.

Major additions to the Eagles since Super Bowl 57

Unlike Veach and the Chiefs, Roseman seems to always be on the lookout for the next move. Whether it's acquiring draft picks, signing flashy free agents or bringing in players that other franchises have given up on, there's a reason the former Reid general manager is still in Philadelphia.

The most important move since the Eagles last went to the Super Bowl was the acquisition of Saquon Barkley, which in retrospect seems pretty obvious.

However, with running backs depreciating in value and big stars at the position failing to live up to their contracts, I think Roseman deserves credit for the move - especially because he's one of those GMs who focuses most on positional value when it comes to the draft.

While Barkley was a successful acquisition - many thought he would be a star in his home state - Roseman also managed to land two of the most lucrative deals in free agency.

Everyone gave up on Mekhi Becton, the former No. 11 pick, until he became a high-end quarterback for the Eagles. Meanwhile, Zach Baun moonlighted as an edge defender and special-teams ace for the New Orleans Saints, and is now an All-Pro halfback.

As with the Chiefs, the coaching staff deserves a lot of credit for those two strokes. No matter what you say about Sirianni, he has a knack for determining what works and what doesn't when it comes to his coaching staff.

Jeff Stoutland has stayed in Philadelphia since the days of Chip Kelly and is one of the greatest offensive line coaches in soccer history. He deserves all the credit for bringing Becton to his potential.

But Sirianni deserves credit for keeping him and bringing in defensive coordinator Vic Fangio, who suggested Baun move to the linebacker position off the ball. And in turn, Roseman gave Fangio the players who made his defense one of the best in the league.

Roseman's selection of Jalen Carter, Nolan Smith Jr, Quinnion Mitchell and Cooper DeJean - all of whom play very important positions - early in the draft may seem like an obvious move in retrospect, but it's not for nothing that social media is rife with statements about how the league continues to allow Roseman to go unpunished during the NFL Draft.

This is a Hall of Fame GM who makes sure his roster is as good as it can be at any given moment, regardless of who his head coach is.... This Super Bowl is Reid vs. Roseman, not Reid vs. Sirianni.

Eagles' major losses since Super Bowl 57

The way Roseman is running the Eagles has a lot of turnover. Miles Sanders' departure seems genius now, but it wasn't at the time.

The same can be said for Isaac Seumalo, T.J. Edwards, Marcus Epps and Kezir White. But all five of those players played at less valuable positions, and once their value increased, Roseman let someone else pay for them and replaced them with inexpensive free agents or players on rookie contracts (Barkley is a notable exception).

No matter how much well-deserved praise he receives, the level at which Roseman runs the organization remains underappreciated. He's only 49 years old and already has a resume that puts him on par with some of the greatest GMs in NFL history.

Equally impressive is the way he has replaced talented players on a defensive line that was the strength of an Eagles team that went to the Super Bowl two years ago.

Aging star Fletcher Cox, disgruntled veteran Haason Reddick, and star looking for a bigger paycheck, Javon Hargrave - all three were replaced by first-round picks from Georgia: Carter, Smith and Jordan Davis. Roseman should send Kirby Smart a bottle of champagne.

Sirianni deserves his flowers, too, for losing both of his coordinators after Super Bowl 57 and replacing them with Brian Johnson and Sean Desai - and he had the foresight to walk away from both of them after one season knowing he could do better.

Were either of them a problem last year? Probably not. But would the Eagles be on that stage again against the Chiefs if they hadn't replaced them with Fangio and Kellen Moore? That's a great sliding door moment, and it's what got Philadelphia to this point.