The good news is that the rear mounting frame is identical for both camera types, and always has been.
The mounting frame is designed to fit into the corner of the room and to stay there. We recommend an anti-pick mastic is applied around the edge of the frame to minimise ligature risk so once it is in you don’t want to take it out.
So apart from the obvious cabling and recording challenges you may have once less headache you need to consider is the physical swap out. It is just six screws.