Seems too different to just be fading. Also, the Jeep is garaged and only has the soft top windows removed when I am on the trail. It just doesn't see that much sun to be significantly faded.
I'm feeling better about the seat cover color and figure that the difference in the grey color is fading. Once I got it installed, the difference is not as pronounced as I had envisioned.
Thanks for the awesome idea!! 
