In Creighton’s drawing, these indications of scale are lost. He makes the pen strokes thinner than they really are. In particular, he makes the initial character (the “circle”) bigger than it is in the original, especially its internal diameter.
You mention the scale, and one would expect that anyone drawing such a small circle with that type of pen would be lucky to form a perfect circle.
I would say all scott has done is just draw it as it was men't to be, a circle.
But to hang him for a difference in the internal size of the circles diameter is taking it a bit far, and i think some others would agree, but then using those fine observations one could then say Scott's outer diameter is smaller than Vyse's.
Obviously i can see why your pointing this out , but i think your obsessing now.