Question about SD and SDR Yolks and steering angles

Yup, Ash is right. If there is no steering angle difference then it's down to aesthetics. But that's a big difference as the SDR clamps are CNCd, I think), and black where as the SD clamps are cast and silver and quite frankly a bit of a visual disappointment compared to many other bikes.

And I need a mini project to do to the bike

Very interesting. I suspected as much. I will try and confirm with KTM people I know on Monday.

I haven't been able to find out anything more yet about whether there is a difference in steering angle between the SD and the SDR.

But got the triple clamps through today and they are lovely - much nicer than the standard SD ones so I will be swapping them over just for the aesthetics anyway.