Even the same model different bodies will have different results. There are many things that can cause this. My 35mmL has a +2 on my 5D MK II while my 5D Mark III had a +17. Canon calibrated the lens on their reference 1D Mark III and it was right on, while only changing a couple of points on the 5D Mark II. There were different numbers for my 7D as well.My 5D Mark II seemed to have a big difference, but I did not use FoCal at the time. I'll check my new 5D Mark III with the lens.I wish there were a macro setting for the 100mm L, I'm certain that the AFMA value will be a lot different at near macro distances.
It wasn't for me. For the 100L Macro on my 1D X, it was +4 at 50x FL, +2 at 25x FL, and +3 close up (filled the frame with FoCal's tiny target). On the 7D, it's +2, +3, and +2, respectively, and the 5DII was -2, -1, and 0.
My 7D required bigger AFMA numbers than 5D2.
Usually, if a lens was front or rear focusing on one body, it did the same on all, just a different amount. However, there were exceptions. I've done it with dozens of lenses on several cameras.