I believe (without verified research) that all three applications that enter the transmission on the driver side (left side) are the same replacement part number and the 4-speed version (enters on the right side (passengers side) of the trans is the only different one.
C-6 applications are slightly more to the rear (slightly different hardware/length) so I would not be surprised that for "Factory Use", Ford had a different engineering number than the C4 or 3-speedo's, but about 100% sure the Service Part would be the same.