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