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U wana put it in a north american s3?

Yeah was gona say that. U could swap the whole motherboard but youd lose the US radio?
What about the lte international version tho? Wouldn't that work with US carriers?
These are completely different chipsets. There is no reason they would be compatible.
Search for teardowns of the Exynos and Qualcomm versions. The motherboard layouts are very different.