Visual error in colors

out,

I believe it is your colour perception that is influenced by the (different) surroundings.

The colour of the path/Bounding Box lines on the selected one can make a difference, as can the closer spots.

You can try to compare the colour values.

You can also draw a long narrow possibly rotated rectangle that overlaps both dice in question and use the eyedropper to copy the fill colour from one and then the other, and see what you see; more specifically how you see the same long rectangle colour over each of the dice and over the paler area in between.