Well, Meguiars doesn't label their productd accordingly, but
1. Meguiars #9 SMR/Body Shop Hand polish/#2 fine cut ressembles 3M SMR.
2. The Body Shop swirl free polish is close to 3M Perfect It III machine glaze.
3. #1 medium cut is close to 3M Finesse It II.
Heavy Cut Ceaner #4 close to 3M fine Cut RC.
4. #7, #3, and #5 is close to 3M IHG.
Well this is just a guess at it based on my knowledge, 3M and Meguiars are different lines, but Meguiars uses a better system of naming UMHO with #'s, 3M has so many different product with a crazy naming system, even confuses me sometimes.
Hope this helps,
Jason