Greetings, I own a Mamiya 645-pro. I've got a good few rolls of 220 films in the fridge which I used in my Bronica S2a, which I recently sold. I am now only able to use 120 film, for I only have a back with insert for 120-film. I have an option to buy an 220 insert from a Mamiya M-645, but will it be usable in the 645-Pro backs? I seem to recall that all the inserts where interchangable troughout all the 645 models, but I'm not 100% sure. Does anybody know for sure whether or not I can use a M-645 220 insert in a Mamiya pro back? Thanks!