Does anyone know if the 993 remote can be used with the new Base 3?
Just to clarify:
There's no such thing as a 993 remote. There's a 993 Expansion Set that includes a CAB-2 remote and a charger base. This is the exact same CAB-2 remote that's in the 990 Command Set, which includes a 992 command base/charger. The CAB-2 remote, from either set, will work with the new Base3--because it is the same remote.
The 993 Expansion Set was offered so operators could add an additional CAB-2 (and charger) to their setup. Only one command base is need for a layout, so only a charger, not a command base/charger, is included in the Expansion Set. If you get the Base3, you'll have no need for the 992 command base other than for its charger function.