A:AnswerIt looks like you posted this a while ago, so hopefully this was already answered for you). I may be mistaken, but I'm pretty sure the R3U1 (which is the Ultimate edition) has only minor differences in the color schemes of the keyboard. They both have the same functions. Other than the minor difference, I would say they are very similar (other than a newer year's version--I haven't noticed any differences in the few different year models of the naga that I've had either).
I hope this helps.
