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The problem with the question is that there is no way to describe a sensation, except in terms of other sensations. I don't think it's possible.
If it is impossible to step into the same river twice, is it possible to step into two different rivers at the same time?
On tetrachromatics, I'd guess that the brain does a damn good job of cross-referencing whatever information it gets, making connections and associations from all and any information it recieves, and that it wouldn't matter (from birth) whether a 3-colour, a 4-colour, or a 62 colour, multi-lensed web-cam were providing visual information. Our sensations would only be as similar as our learnt associations were similar.
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