I agree with a lot of the replies so far. IMO they're still the same species, as they're genetically compatible. It's actually possible (though unlikely) that they would mate, even in a natural context (though it would have to be a pretty weird situation).
Imagine you put all the black dogs in Australia and all the white dogs in the USA. Do they immediately become different species just because they're unlikely to mate with each other? I don't think so.
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