Distortion on scaled walls & discoloration

Quick question is there a way to “rescale” a material to fit on a scaled wall segment. My short wall pieces were scaled to fit the room but when I applied a brick material the bricks were scaled as well.

Also on some wall segments the coloring is lighter than the other 400x300 pieces. I tried rotating them to see if it was a normal issue and the back side was correct but does not seem to be the case?

attached is a wall with both issues?

Any thoughts or suggestions?