Not an adcom, take my advice with a grain of salt. I have read conflicting advice about this so IMO it boils down to how you frame it. 3 activities I talked about in my personal statement are also my 3 MMs. I used the MM slots to talk more specifically about each activity - what my tasks were, why the activity was important, and (if I had enough room for all of this) a brief anecdote that was NOT in my personal statement. Basically, I avoided repetition/overlap as much as I could and tried to use each space efficiently. These activities were very meaningful for me in so many different ways that it wouldn't feel right to exclude them just because they were in my personal statement. If it's important enough to you, I would include it for both, just talk about it in a different way.