I'm not sure what you mean by compatibility, but here are a few links:
Comparison between 645, 645N, and 645NII:
https://www.pentaxforums.com/forums/pentax-medium-format-slr-camera-reviews/6...tml#post633134
Pentax 645 Medium Format Lenses (compatible fully with each body above):
Pentax Lens Review Database - Pentax 645 Medium Format Lenses
The key difference between the three bodies is that the 645 is manual focus, while the other two feature AF. The rest are minor features, which can be seen in the table above. AFAIK they use the same accessories and all.
Adam
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