I would "think so" but then you would have the locked bootloader on it already most likely. Not sure what if any other things would not be compatible. I am sure we would need to see the Canadian model motherboard and the ATT model motherboard side by side to see if there were any difference.
I know on my ATT S3 parts of the internals had the international S3 written on them.
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Not too long ago here on the XDA Portal, we covered how Google had made … more
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