It is different, but not clear enough to see details. There are a lot of pictures here on BYC of ocular Mareks eyes. Usually, the iris becomes faded and changes to make the pupil irregular. Sometimes the cornea becomes cloudy which may be what you have in the picture of her left eye.
Are you going to receive a final report on the necropsy, whether it is Mareks or not? Can you post a picture of the gray eye in your chicken, and is the other eye normal? So sorry that you may have this terrible diagnosis. It is kind of late showing up in almost 3 year old chickens. Have you...