Markoz wrote on Jun 17^th, 2012 at 9:01am:

In this you can clearly see the white paint on the engines. So it looks like the left engines have white paint on them, while the right engines do not. Hope you understand what I mean now.

Ahhh :) You mean the white forward cowlings. The answer in this case is very easy. The first picture with the darker cowlings was an earlier production shot, while the image with the cowlings in brighter white display the final result. I only used the first image to demonstrate the chrome effect, as it always appears "nicer" at the right aircraft side, no idea why...