First image is the original
Second image is my attempt
Third image is my desired outcome
I don't know how to make the bottom piece (one in red) have the same colour like the top piece (one in white) does anyone have any advice on how I can do that? I tried using Solid Fill Color and Hue Saturation with a Mask Layer, but it didn't give me the desire outcome like the third image.

with the layer you want to mask selected
in which mode? (top left corner)
and clip it to the shape you're working with
erase tool to remove the spots