Somewhat. One of the garages will overwrite the other, depending on mod load order, but they're not too different, so it should be playable.
You should be able to move from one mod to another, but your garages will get converted. No duplicates. You can have both mods active but, as said before, one garage will take precedence.
You can't use either mod with vanilla OXCE, since the hangar types feature is only in BOXCE.