Currently the a /b /c versions are interoperable (without voltage feedback) ;
the d /e /f versions are interoperable (with voltage feedback).
But the a /b /c (without voltage feedback) versions are not interoperable with the d /e (with voltage feedback) versions.
For more information please click：https://support.bitmain.com/hc/en-us/articles/9608274659737
If you have any questions, please feel free to contact BITMAIN Customer Support.