Yes, mine is an original colour. It is called Medium Red Pearl but we all call it Mica Red. I have seen one other car in the same colour in the UK but am aware that there has been two others, no idea if they are still on the road. There is a beautiful one in New Zealand as well, also a Supercharger. It is rare but beautiful and my favourite colour for them.
Photo of the two together (mine is in front):
You mentioned the differences (mine is also an SC but my previous two MR2s were N/A). The SC has a few more horses on tap, BHP rises from 127 to 145 and there is a slight increase in top end speed and it drops approximately a second off the 0-60 down to about 6.5 from 7.7 (depends on your source, others here will have more official figures). The difference though is actually in the driving. The SC is heavier and more powerful and it shows when you drive it. This does not make it better, the N/A is possibly more like a go kart and it's lightness is an asset. I like them equally to drive but for different reasons. I have an SC because this one came up in this colour and also I do like it's rarity (which does add value) but, I have said this before, a well set up N/A is arguably a better car than a badly set up, rusty SC.
I do like the sound of my engine in a tunnel as well