Are King Gold Crown III "non-A" digital controls interchangeable with the "A" versions?
Yes, the non-A controls (KFS-564/-576/-586/-598) are interchangeable with the A version controls (KFS-564A/-576A/-586A/-598A). The A version controls will plug into their respective non-A version harness with no problems. However, the non-A controls will not work in some A version control harnesses due to tandem operation and KNS-660 frequency management features of the A version controls.