Versions as offered by Plex are only used to reflect different quality files of the same movie (not different cuts/editions). As of today, your best shot is to organize those alternate versions as local extras or to keep them as completely independent library items (Split Apart, then rename both to recognize which is which).
There’s two related feature suggestions:
- support for multiple cuts/editions of movies → Multiple Cuts Of Movie
- more information in version selector → More Info in "Play Version"
