Earth-Mars R-ABC color comparison:

Looks pretty close to my eye.
What I find amusing is:
IF the Earth version had been photographed under a nice shade tree, THEN the NASA "true color" version would have been bluish -- without any attempt to "white balance" the image and compensate for the color of the anbient light -- something any professsional photographer ( or a smart digital camera ) would do automatically.
See White Balance for an explanation of my gripe with NASA from day one.