Graham,
Physically, yes you can connect them.

BUT......the two microprocessors will not talk to eachother.
Panasonic and Kenwood use proprietary data buses.
Understand?






there is a way if you know the pinout order on both

You can't connect them. The data protocal is different.

Dose anyone know the pin outs for a Kenwood kdc-c603 10 disk changer and a panasonic cq-df401u deck, i