Fastpitch vs. Modified Pitch (ASA)

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Other than the pitching regulations, what are the differences between fast pitch and modified pitch? I'm scheduled to do a men's MP next week, and there are a few women's MP leagues I could be doing.

One specific question is regarding HBP. I know there is no HBP in slow pitch, and the rulebook says fastpitch only in 8.1.F

8.1.F is also where it states "the hands are not to be considered part of the bat". Are the hands part of the bat in MP and SP?