The flange is wider and about 7mm larger overall and about 1mm thicker, and covers up some of the printing on my panel. I had to do some sanding/filing to get it to start to enter the opening and it fit the opening so closely that there is no way I'm going to be able to force it past the ridges that are intended to retain it. It needs some fine tuning, is what I am saying, at least with my printer and my panel. YMMV
EDIT: I printed the rocker and it fits well without modification. Overall I think it will be very usable and the designer did an excellent job!