It looks like saves at least won't be compatible:
This adds to the disappointment... I'm still playing Pulse, only to get better for the Convention. Once I know which version is bug-free and played on multiplayer, with compatible packs (in case I ever buy them, I won't for now), then I'll buy this version, and sell the EU version I have now. Or maybe keep it, because I'd advice anyone to buy the bug-free version as well...