After the game is updated, some files have no "unityfs" header, and each file seems to be encrypted differently

[sunnyboy76]

I guess an app should not encrypt different files in many ways, but the changed files seem to be completely different except for the first seven characters.

example:
https://drive.google.com/drive/folders/1Us85E4CIqdu4S1cQUTIRDg3YbPwFHpLx?usp=sharing

File 1 has not been changed yet
The other two are changed and encrypted

Game links:
https://www.jgg18.xyz/games/xproject/