In case of turntable I would check minimum lens focus distance.
EOS R is full frame where crop factor is 1.0.
A6000 is APS-C chip with crop factor 1.5, which results in narrower field of view.
With the correct combination of camera(crop factor) and lens you will be able to take photos from the closest possible distance => smaller object will cover larger area on photo...
Someone with better experiences with lenses would give you more accurate answer.
EDIT: overall, sharper lens with higher focus range will make photogrammetry better than just camera with some extra Mpix sensor or slightly better noise @ISO100