Actually, one difference...
The neck strap. The first one was just narrow from end to end, whereas the second (crinkly finish body) was wider around the middle with Mamiya written on it. Actually, I was glad with the first one as I attached one of those leather hand grips - but you cant permanently attach to the tripod socket on these camera so I cut up this neck strap to run through the grip and back through the lower strap lug on the other side. Works very well!
Leica M's + Mamiya 7II