I don't believe it's as varied as you imply Soli. To the best of my knowledge all the US versions, which account for 3 of the 4 model numbers, use the same Adreno 224 GNU chip, the same Qualcomm Snapdragon 8960 CPU, and offer the same 2GB RAM. Same features, same size, same battery, same sensors, same display, same camera, same connectivity and expansion capabilities.
The differences are the TMobile version won't support LTE, the Verizon version won't work with GSM, and the ATT won't work with CDMA, thus three differnt model numbers. Otherwise the available colors are the only difference that I can see.
The only other model is the international version and every one of those has the same 1GB RAM, same Cortex A9 CPU, same Exynos Quad chipset, same Mali 400 GPU. Same features, same size, same battery, same sensors, same display, same camera, same connectivity and expansion capabilities as far as I can see. Two hardware builds in other words, one for the US and one for everywhere else.
EDIT: By the way, thank you so much for reminding me about the baseband chips. I had a nagging feeling I was a little confused when I made the original post. That's one of the good things about AI members. They don't mind taking the time to correct me if I'm mistaken.
Edited by Gatorguy - 7/13/12 at 8:05pm