For math students again

Just a small brain exercise before you dig in more VCE stuff. Should be easy. There two squares, side length 4 cm and 5 cm as per the illustration. They were put together randomly so the shaded area apparently is overlapping.

Question, what is the area difference in CM 2 of the two non shaded white areas?

Just a small brain exercise before you dig in more VCE stuff. Should be easy. There two squares, side length 4 cm and 5 cm as per the illustration. They were put together randomly so the shaded area apparently is overlapping.

Question, what is the area difference in CM 2 of the two non shaded white areas?