I can't imagine that it wouldn't be.
The original Banzai Bootcamp had no problems carrying over from PR1, to MP1, to MP2, to MP2.whatever. Chances are it wouldn't have a problem going over to NBT-HC or MP3 (and the subsequent patches).
However, I see
Gisk reading this, and he's more knowledgeable on this than I am. So pay attention to him, not me.