Was the paint added later? And is the artist also the scribe?

[ReneZ]

So many people here don't even believe in different persons for A and B text? That's surprising to me.

Based on the textual statistics? I am not at all sure.

Based on the handwriting variations? I am more confident but a bit less than 100% sure.

In the herbal part, the differences are striking.

In the zodiac, where all text is in one hand (hand 4), namely the hand that did all circular texts, there is a gradual introduction of B-language words.

Nothing really fits perfectly.

Now one can entertain the hypothesis that hand 4 looks different from the others, just because the guy was writing in circles and must have had a different posture, but my confidence in this is quite low.