I think the POS&NEG are the really old style (1975???)
Later models are with the SIN and COS
Last model is with the simnet
To be sure, you could ask "LeCanard", he knows all these kind of things, or some of the B&G dealers like Miles or the other one, look in these forums.
I think they are NOT compatible, the old style is driven by CURRENT (ma), and the SIN\COS is driven by VOLTAGE