PS4 versions of Kingdom Hearts (and probably other PS3/PS4 remasters) add a special header to every file to override a specific texture or sound file.
For example, the file
arc_en/boss/b01dc00.arc is the original file found in Final Mix version, wrapped with the remastered header that specifies the files
GNF files (PS4 textures) will override the loading of the original assets.
If a file does not contain any remastered asset (like raw binary files that contains only gameplay data) have just the minimum header.