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[RobGea]

What is the point of duplicating diagrams within one version of the manuscript?

You might be right, but considering the other 8 zodiac folios have approx. 30 nymphs each
and then Aries has 2 folios of 15 nymphs (2x15 =30), same for Taurus.

Then the  question becomes why has Aries + Taurus been split into 2 ?
And  pjburkshire's answer is totally valid.

P.S if they (2xAries, 2xTaurus) differ both stylistically and semantically then they are not duplicates, but thats just me being pedantic.