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I'm not 100% on this but I do now recall that newer nVidia drivers allow for the same cards but different brands to work in SLI. Definatley worth confirming though. Big B probably knows for sure.
I think as long as the cards have the same core and BIOS then it should work.
I'm not 100% on that so I'd see if Big B (the HWF overlord / Godfather) replies :)