Yep -if it is all in a ZERO lift attitude (vertical dive trimmed to establish vertical ) it would be 50/50.
One of those "ideal" worlds which few see.
I got a pair of George Hicks' TENSORS to play with -one for me n one for son Guy
these little toys take a bit of up trim in all ailerons - to get roll perfect.
When you look at the aileron linkage -it is apparant coupled ailerons do not move at same rate - due to off center attaching points.
So geometry of throws as well as AOA change the picture .
When we played pattern models for many years -there was a bunch of "voodoo" aerodynamics batted about - among them was differential in respect to position of wing to thrust line -- I could not make sense of it.