Hello, my friend told me that the AT&T version of the Torch is different from the standard Torch-es around? Is that true? Are there any significant differences between Torch-es or variants among them?

Apparently the back cover is different. One is like smooth, the other is a rubbery back. And the loudspeaker is clearer or something like that. And presumably, the phone is "lighter" than normal. Been searching on the internet and can't find anything.