I asked this same exact question, and I went ahead and purchased the Evotech mount and Zumo XT GPS. The only cool thing about the Ducati utility mount is the tubular design so you could mount an additional accessory, but it would be very crapped as the Zumo screen is very wide and takes up the majority of the space. I DID find out that the Ducati $922 kit has the cable already wired out of the box. Basically, you don't have to splice the dummy blank to the Zumo kit.
What I had to do was remove the dummy connector, and cut away the black outer layer, which exposes the wires. From there, you have to splice those wires onto the Zumo XT cable kit. The Ducati kit skips all of that. FYI, here is my security solution, security screw on some side with red Loctite and ram mount security knob. I also have the Motopump plate which prevents it from be unclipped.
What I had to do was remove the dummy connector, and cut away the black outer layer, which exposes the wires. From there, you have to splice those wires onto the Zumo XT cable kit. The Ducati kit skips all of that. FYI, here is my security solution, security screw on some side with red Loctite and ram mount security knob. I also have the Motopump plate which prevents it from be unclipped.