Few months ago I modified Perun moto KTM 690 Enduro Luggage rack SD to fit on KTM 450 Rally Replica, for fellow rider from Austria. Bolt pattern on 450 RR tank is same as bolt pattern on KTM 690 Enduro R. Angle is also same. But 450 Rally Replica has tail light on top of rear fairing. That required cutting piece of lower bracket of the rack, to make room for tail light.
Still there is little clearance, but it should be fine, since this rack will be used only to carry small stuff, like Kriega US-5 Drypack and as strapping point for rack-less saddlebags.