Can anyone tell me the differences between the LG X Venture H700 (AT&T) model and the US701 (US Cellular) model?

Are there any significant differences? I'm using an H700 up here in Canada, but I can't find another used one at a reasonable price to use on my GSM carrier. Will the US701 function exactly the same way? If not, what differences will there be? I was told by LG head office in the US that it will do GSM fine. Is that true? Anything else I should know?