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How can I recompress a Unity game to data.unity3d etc. files, once decompressed to single files: resources.assets, resources.resource, sharedassets0.assets etc.?

I'm working on a Flashback (classic) re-translation (horrible Google Translation for non-english languages), but found the Steam version was packed to data.unity3d... files, and GOG version instead was uncompressed. I can uncompress it with UABE I guess, but how can I re-compress them back to data.unity3d? I'd like to release a simple final diff-patch for the original Steam format files.

Ooops, I missed it is already built-in in UABE (Unity Assets Bundle Extractor):
File menu > Open (also .unity3d files),
then choose Yes to decompress it on request,
finally you can Import back a modified resources.assets file overwriting original,
then you can Save an uncompressed .unity3d file,
finally you can simply File > Compress the new .unity3d file.