The length and width seem to be about the exact same.
2.48" (Sprint) = 62.992mm....63mm (T-mobile version)
4.88" (Sprint) = 123.952 mm....123.9mm (T-mobile)
But the thickness seems to be a little off.
0.44" (Sprint) = 11.176mm.....but T-mobile's version is 10.88mm. Nearly 3% thicker, but not sure if that's significant enough in terms of case fittings.