A "Rotte" is a file, so I would translate "rottenmäßig" as "by files".

"rottengleich" could be something like "by equal files".

Do you have the original German text ?

Another meaning of "rottengleich" is given here:

https://books.google.de/books?id=O1VOAAAAcAAJ&pg=RA1-PA294&dq=rottengleich