I believe the DCS cart had the F-N-R down by your knee and the PDS has the rocker switch on the dash.
The DCX Alltrax for the DCS cart has a 9 pin plug that goes into the controller, the PDS will have a 9 pin converter wiring harness that splits it into 3 separate plugs.
I think the DCS was made from 1996 to 1999 and the rest are PDS.