2x 9800gt withy different video bios versions, cuases problems??

Originally to use SLI the video cards had to be identical – same GPU, same manufacturer and even same BIOS version. From GeForce driver release 80 on nVidia relaxed a little bit and now the video cards can be from different manufacturers, but they must be based on the same GPU. This rule is valid for all versions of SLI (SLI, Quad SLI and Three-way SLI).

Does that mean that http://www.techpowerup.com/gpuz/ud4vf/ and http://www.techpowerup.com/gpuz/dvhnr/ should be able to sli? Only difference is bios version and device id. But I heard that gt and gtx are out so there must be more to this question.