Can we make isoglosses?

[Aga Tentakulus]

   

As an example, this is how I see the f66 from the ink, all at the same time.
VM text, German text, and drawing.
No colour or contrast change visible in the ink.

Unfortunately, there is also too little text here to be compared with f116.

With f116 I also see no difference in text and drawing. I do see a similarity between the drawings (nymphs). Drawing style.

I would not give much time difference.