Compatibility question - SONY FH units

Sony FH-110W has double deck, and identical 13 pin connector as FH-150R single deck. Same generation of units, although first one is without remote control. It smells like compatible, but I'm afraid to plug and see what would happen.

I have service manual for FH-150R but I couldn't find manual for FH-110W. It would be nice to pimp FH-150R with double deck, and use some newer remote that supports control of both decks.

Can anyone please tell me if those decks are interchangable?


Thank you in advance!

Tough question.
I have an FH11W with the double deck.
I would imagine they are compatible if their sockets align, but we need to make sure.