Synaesthesia is an interesting topic to bring into this. Although in this condition people can hear colors and see sounds etc this doesn't really answer whether they are experiencing the same. Again if you see a middle c as pink how you do know that the color you refer to as pink isn't the color I refer to as green (perceptually). I am not sure that this question will ever be answered since we can't experience another persons life, however there may be ways of inferring, which is why I brought up the concept of taste (by which I mean fashion or aesthetics) Art has suggested that certain colors are opposites. And it is true that certain colors stand out against one another this would suggest that we perceive the same colors. However some people seem to be inherently incapable of recognizing the jarring effect of certain color combinations, do they have a different perception of color or do they have another lesion elsewhere that just means they enjoy these jarring effects.