The two types of 9600 logic board should swap okay, provided you have compatible CPU cards for the type you switch to.
The problem with putting the 9500 board in the 9600 case is simply that the power supply connector was changed. You can still do it by either swapping the power supply (fit?) or by building an electrical adapter.
The problem with putting the 9500 board in the 9600 case is simply that the power supply connector was changed. You can still do it by either swapping the power supply (fit?) or by building an electrical adapter.