a pro key will not work with home, an OEM key will not work with a retail CD and vice versa.
basically it has to be the same version AND the same licence type. I'm pretty sure that which service pack shouldn't matter but i don't know for sure.
I'm pretty sure other licence types have incompatable keys too but i'm not sure about that, i.e. Open licence, select licence, enterprise licence, gov/academic licence, enterprise subscription...
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