While they shared the same exact white gold case, the thinking at the time by collectors seemed to be that they wanted a watch at a cheaper price point to maximize profit going to the Foundation, as well as the fact that, let's face it, the socialites buying the Prince's Foundation watch were buying it because they knew the Prince and didn't care what movement it had. I will say however that if you haven't seen the caseback on that charity watch, you should look it up. It's an example of absoutley superb hand engraving done in-house at Chopard. There's really so little hand-engraving done on casebacks anymore, by anyone really.