I agree with Ritchey, the photos are not particularl useful.
Take out the bezel, and the background shade is nearly identical:
I took the image linked before, and cropped out the bezel, and (just for kicks) switched the older screen to the left. I notice that the background IRL is also much lighter than the photo....
I'm pretty sure the screen and substrate is the same, they just upped the contrast in a software setting. When the K2 came out, lots of people pointed out how low the contrast was compared to the K1. Why they never upped the contrast for the K2 is beyond me....