RD6442 to RD6445 install - Help required

HI, I have just received an RDC6445S to replace my current RDC6442S on my 80W Bodor 600mmx500mm laser. I have been told it is a wire for wire replacement which I am fairly confident of doing but I am not sure if there is a way I can install the 6445 and restore the current USER and FACTORY Parameters without the head going mad !!! Is there a way to disable the XYZ motors ie leaving them unplugged, so that the parameters can be installed first ??
Any advice on the best way to go about installing the parameters etc would be greatly appreciated.
Cheers
Kev