I was gonna say the same thing, but like I said, you can't tell the difference in screen shots. Either that, or you actually have the same version as mine b/c in person, they are totally different, I have personally seen it more than once...
EDIT: Well you can see the difference a little in that your black is darker, but in person its WAY darker and mine is WAY more washed out, trust me. Also, I don't know if the brightness being set differently on ours matters or not for screen shots..I 99% doubt it though.