I've just compared the service manuals for the two and it appears that J1 is the same but J2 has an extra sync x talk line on pin 1 on the G16S cards and everything else is moved along by one pin. There is also an additional reset pin on the G16S for the microprocessor on the card. It is possible that the connector position has moved so that the pin positions are the same but I can't quite see from the manual.