The RB II rose gold is an awesome watch, but the dial needs to be modded to resemble gen more accurately.
The gen has a semi skeleton dial and on the rep, the dial, or specifically, the layer below the dial looks different.
I have not studied the watch in detail, but there are a lot of info regarding this specific aspect of the RB II here.
Regarding the thickness, I think the rep is still a little thicker than gen but I wouldnt worry about that. Thickness is visually relative in most cases. You need to compare a gen and rep side by side in order to see the difference. On the wrist? Its somewhat inconspicuous to me.