Just display an entire white, black, red, green, yellow of each on the screen. If there aren't any big local problems or much more on one screen than the other it is just a different color profile.
BTW the right one might be the truer one. Most Notebooks come way too cold. A calibrated screen is usually warmer in color. The difference between the out of box profile and the one I am running now seems about as big. The one I am running would be the warm screen on the right.
Just make your own color profile if it looks too warm.