Here are some comparison photos. Warning, photos of eInk readers are not what our eyes might actually see. I did side by side comparisons with the PW on the left and the Touch on the right, then I reversed them, took a second photo at about the same angle and settings.
Kindles PW and Touch Side by Side with Light Set to 0/24 (Off):
Kindles PW and Touch Side by Side with Light Set to 14/24:
Note: If I change the settings on the camera to better show the lighted PW then the Touch gets too dark in the photo, and vice versa. I will take some better photos of the PW lighted and by itself. the photos SXS I took at full brightness on the PW were too washed out so I didn't upload them.