Does the color of the mouse play any role in feeding response? My guy is a good eater/just had perfect shed & bm/ ate 11 days ago/didn't eat while shedding/temps and humidity are the same.

I just recently bought new mice. I went from the f/t small mice to the medium mice. They are black whereas the smalls were white. He smelled it but that was it. Just wondering if color or maybe the size could be throwing him off?