Charlie Brown's 'Cyclopedia

Two sets of books are grouped here on LT into the same series.

https://www.librarything.com/series/Charlie+Brown%27s+%27Cyclopedia

I own part of both the 12-book and the 15-book sets. The books are organized and ordered differently. For example,

Vol 4 of the 12-book set is https://www.librarything.com/work/2411284 Cars and Trains and Other Things That Move
-vs-
Vol 4 of the 15-book set is https://www.librarything.com/work/3196200 Creatures of Land and Sea

with each book of the longer (later?) series featuring chapters. The pages of each book in the shorter series starts where the previous book ended.

Is there a good way to split this existing series into two?

ETA: Update to my question: Would moving "Super Questions and Answers and Amazing Facts" out of the parentheses for the 12-book series cause issues?

I wonder if there's a reason I'm missing for the combination of the two sets on one series page.

I took some time putting the Book Trails series together, as there are major numbering differences in sets produced in different decades, and I own both. Setting canonical titles helped a lot to clean it up.

https://www.librarything.com/series/Book+Trails