I've done this. Everything is the same except there are 2 pin outs (I believe SN#40,000 is the change over). They supply the keywells, sans keycaps, and they are plug and play, no other parts, and are held in with 3 screws each.
If you order the red Cherry keywells, they can also send you the red switches for the thumb clusters. You can desolder/solder them, or just change out the stems with no soldering. (EDIT---This is an additional cost)