SLI Question

[Double Jesus]

I currently have an EVGA 7800gt CO PN # 256-P2N516-AX and I'm looking at buying a second 7800gt OC from someone on the forums here, it's PN is # 256-P2N515-AX.

Will these 2 cards be ok for sli together? I'm pretty sure they will be but I have 0 experience with the sli.

Thanks!