Hi Jon,
I just have connected my old Beocord 1600 to a Beomaster 1001 (a BM1200 without AM) that I am currently restoring and I can tell you that it works perfectly.
There is another difference about the sockets, the BC1600 is only in Din whereas the BC1200 is both DIN and RCA and will match better with non-B&O equipments.
Marc