Go to partzilla.com, plug in both in parts lists and compare the part numbers. There are differences. Bear in mind for entire caliper the bracket may make the difference, the C model uses leading axle and the other does not and should alter the bracket a slight bit. Also something in the caliper long slider bolts may have changed at some point too, there are indicators for it in the pics. Largely though the caliper itself seems to be the same, but Honda changes the number with the slightest mod to a part. FYI, the middle digits 425 mean CB750 and MA5 means 750C-B model, meaning there are likely small differences. The middle numbers change every time a new part mod shows up on a newer model, it can be so slight as to not be easy to see.