Yamaha CS80

I have a Yamaha CS50 and a just got a Yamaha E70 Electone organ.  I know that the E70 has the same PASS architecture as the CS50/CS80.  So does that mean that I could swap out a voice card in my CS50 with a voice card in the CS80??????

I assume not because they connecting wires are different.  But if anyone know, it would be helpful.  One of my CS50 voice cards has something wrong with it and I cant get notes in tune throughout the entire range of tones (yes I know how to calibrate it).