Acoarst that will work. If you allow only one variable to
be controlled by the cameras, the cameras would both
behave alike. It's if you allow the cameras to govern 2
variables [or more] that they don't act the same.
With only 1 variable controlled by the cameras all they
need to agree on is the correct exposure, and that will
result in the same choice on that 1 variable.
But let the camera govern 2 variable and now they are
deciding more than just the correct exposure. They will
attempt to make "aesthetic" choices about DoF, motion
rendering, etc ... which are subjective decisions and so
different models may be programmed differently to get
the same histogram via different combinations of those
2 or more camera-governed variables.
The problem here is that a user wants to relinquish user
control of 2 or more variables. Clearly if the user allows
only 1 variable to be controlled by the cameras then the
cameras would behave alike. It's a contrived complaint
in that the user does not welcome the simple solution.
Surely the art of photography is that the photographer controls the camera and not the other way round. Otherwise one may as well set the camera to automatic, where it controls all parameters and one uses it as a point and shoot camera.I would take issue when you say 'Clearly if the user allows only 1 variable to be controlled by the cameras then the cameras would behave alike'. No, they should behave alike, but not necessarily. One would have to test this, as the electronics of the two models may be different.