There is a report in today WSJ that there is a version of MCAS on the 767 based USAF tankers. (KC-46?)
This preceded the 737 Max system. It seems the wing pods for the refuel gear added extra lift.
https://www.wsj.com/articles/before-737-max-boeings-flight-control-system-included-key-safeguards-
Most WSJ articles are behind a paywall. It sees the tanker version relied on multiple inputs and had a control column cutoff.
Also it only made single adjustments to trim
I might have missed it but I don't seem to remember any mention of this previous system in this thread.
20driver