Hi
just a thought..
Each engine will be totally independant of the other, each has its own fuel suppy, fuel pumps, hydraulics, Engine computers (FADECs) etc.
a while ago i went to pick up an aircraft (executive jet) from servicing. it had just had two new fuel guages fitted but niether of them would work even though they each had their own electrical source and were reading from diferent tanks.. the engineers were scratching their heads! as the guages worked when bench tested.
we all know how engineers dont like us pilots to tell them why something isnt working but i sugested the only common factor these guages had was "earth"
they dissmissed my thoughts and sent me back to the hotel.
The next day a diferent engineer told me that it turned out the guages had not been properly earthed when initially fitted but all working now so off we went.
my point here is once again the only common factor these engines have is all their electrical components are earthed...