Ronnie was huge, make no mistake, but his joints and frame make him look bigger than he is, especially when standing alone.
So when someone tries to shop 2 pics together, naturally the eye is going to compare muscle size using such measuing sticks as the waist and shoulder width, which is NOT accurate, as Dorians frame is much, much larger than Ronnies. Any comparison where Ronnies waist is comparable to Dorians is obviously scaled way wrong. Any comparison where Ronnies calves compare to Dorians is laughable, at best.
Comparing 2 pics of the 2 of them is futile IMHO, too many variables (angle, distance from stage, position of body, the way they lean, etc) and you can never get a good idea of how the 2 look standing side by side.