You’re right. There is a marked shift in color between the two images.
Sadly it’s the other way around. Reverse temporal order. I used the new one first and the old one second. The shift is from light to dark, unless we think mirror, but then the metaphors get out of hand.
What I am wondering is that the names of the files also change. If the images are subtracted, is the shift a constant displacement? Is the distance between the file name strings a function of that displacement between colors?