Exactly as said above, all of the M645 lenses work perfectly on AFD and DF obviously with manual focus and manual aperture control, newer N lenses need to be flipped from an (A) setting on the base of the lens to (M) which allows you to manually control the aperture. If you leave it in A no matter what aperture you select (I believe based on my 300mm f/2.8 APO) it will remain wide open.
Now, if you are asking about putting autofocus lenses on an older Mamiya body this is not possible since they lack the electronic contacts.