@Novus-Wojtek LOUD is based entirely on the original EXE, so that points to some differences that aren't currently resolved.
Marlo has indeed made considerable progress in putting together a version of this project which is entirely compatible, which would be a potential boon for both LOUD and users of the Steam version of the game. My personal feeling is this - if this work can reach to all the many players who don't use FAF, or LOUD - then it's only good for both communities.