[ashlar]

I have found a way to play the second version (or the third or fourth, etc., I suppose).

If one selects Info on a movie with multiple versions, there's a button on the bottom left in the Info window. There you can browse the versions, with the same window that appears when you press Play on a movie. This time there's other options available (but renaming versions is not one of them) and if you select a version, that's the version that you get to play if you press the Play button in that window.