Well, you obviously know what part number belongs to which products at Crucial then?

I dont know though, but most likely they call PCxxxx x-x-x-x x.xV partnumber 1 and PCyyyy y-y-y-y y.yV partnumber 2 etc. Every Voltage change, speed or timing will have a different part number. Revisions however... no, it will have a different serie number but nothing else.

CPU's for example, they come with different batches. If you buy one in January, really like the speed and performance and buy another one 6 months later you're not guaranteed it will OC the same.

But well, at least you're lucky with those 'sucking' Canadians and you can get it returned. Instead of whining I'd take a lesson from this, for the last time, Crucial wasnt wrong here. They simply sell a Dual Channel kit at certain specifications. They don't guarantee it will have the same IC's, PCB or will run mixed with previous named sticks with same specifications.