Sorry guys, but that's not a Z3 in the images. That's Z1 on the left and Z2 on the right. Look at the top back side, they are different, there's a slit on the left one. Homescreen themes are also from Z1 and Z2 promo images, Z3's launcher has a different clock and brighter overall theme.
Are you drunk guys?
The differentiation on color is because those are two different models. Both of them, by the way, are NOT the z3.
The one on the left is Z1, the right is Z2.