I don't know if this has been noted before, but I just found this out:
I have worn a Dawn Black frogman for the past month or so. The band did not fit perfectly--it was either too tight or too loose, so I enlarged the third set of holes down from the bezel and now it fits well.
I recently got a MIRB frogman off ebay, and I noticed it fits perfectly on the third set of holes--no enlarging needed! I compared the bands and found that the MIRB frogman band is slightly longer on both ends than the Dawn Black frogman's band.
I thought all 200 series frogs would be the same. Apparently not.