Remember Viking
Colour perception under different lighting is a tricky one. If you force the colour tabs to be the same colour as they are on Earth, then you're forcing a blue sky/yellow sun lighting setup.
if the sky is actually ochre-grey and the sun a weaker light (as seems plausible) then you SHOULDN'T match the colours of the tabs.
Try playing with coloured lightbulbs or filters and a coloured target - you'll see what I mean. In the extreme, you can't tell some colours apart.