All the versions are basically the same externally.
I have a v1 and a v3, ones a 3T and and the other 4T, I dont' recall which is which; the stators are interchangeable between rotors, and I think I actually have them swapped right now.
The only part that is different enough between them to need swapping with the stator is the cover, at least between v1 and 3, because the axle is a different size on one end at the cover bearing on (IIRC) the v3, where it isn't on the v1.
The v2 is probably the same as one of those, dunno which one.
Anyway, just saying that if you have to buy a whole motor, you can almost certainly swap the stator (and covers) from one into the other, from any version to any other version.
You just have to make sure you get the same axle width from dropout to dropout.
And don't crush your fingers or anything when pulling the one stator, or installing the other.