Galaxy 3 International GT-I9300 vs AT&T version

What is the difference? I was going to get an unlocked international version from Amazon but now I find out that it is not fully compatible with AT&T. AT&T apparently has their own
version of it that uses a different processor & U won't be able be able to get 4G speeds. Is this true?

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The international version doesnt have the same lte frequencies that at&t uses. So no it wouldn't work correctly

sent from my phone