Plex doesn’t currently have a concept of different editions for tv shows / episodes. Your files are treated as different-quality versions of the same video.
IIRC Plex will pick a version based on quality aspects and client compatibility (not sure if it’ll fallback to an alphabetical order if the other aspects are the same or similar).
Personally I’m currently opting to treat my non-preferred edition of an episode as a local extra (while keeping my fingers crossed for proper edition support, e.g.
Parks and Recreation
Season 04
Parks and Recreation S04E06.ext
Parks and Recreation S04E06 - Extended Version-other.ext
