I guess to me a sequel to an alternate ending is different from a sequel that doesn't contradict canon. But there's probably a point where subdividing too far gets way too messy (I just have this...cataloging impulse. I'm probably a lumper, not a splitter, taxonomically speaking).

Oooh, also: while I don't think any fic exists yet, it SHOULD: does Terry Pratchett's Maskerade count as a "version"? (I don't know if it should, but I want to encourage fic, yes yes).

*off to register, post lonely fic, and play around*