NOTE: Don't use this for CaCs
Method found by the user: leanmb56
For this example, I'll be swaping Ryo's (In the screenshots I'm using OniFox's Master Chief mod) Character Selection Screen animation with Ichigo's.
1) Go to this path JUMP_FORCE\Content\Game (With the game files already extracted) to get your files, in this case, the three files we need are "chr0220_lobby_anim.uasset" , "chr0240_lobby_anim.uexp" and "chr0240_lobby_anim.uasset"
2) Open "chr0220_lobby_anim.uasset" and "chr0240_lobby_anim.uasset" in a hex editor software, in my case I'll use HxD 
3) Now what you need to do is copy these strings from "chr0220_lobby_anim.uasset"




And replace the ones on "chr0240_lobby_anim.uasset", if done correctly, the file will look like this


Now just save wherever you like, but remember to keep a copy of the original files just in case
4) Now, rename your saved file from "chr0240_lobby_anim.uasset" to "chr0220_lobby_anim.uasset", then, take "chr0240_lobby_anim.uexp" and rename it to "chr0220_lobby_anim.uexp". Now go to your repacker and recreate the paths from which the files were taken from


5) Now just test in game