Even within the S2R I think the Dark has one diameter and the non-dark (colored?) has something else. They were sold with different handle bars, one is tapered I think. So if they're different does that mean I need all new controls? That would suck.
No. The diameter at the clamp is different, not at the controls. If the bars are of the same length, you shouldn't need to change anything. If hey are longer, you may need to get new cables made.