I have searched the web but cannot find the answer.
It could be a number of composers.
I think it could be someone who wrote a lot of symphones.
Haydn wrote over a 100 symphonies and unless you were an expert could all sound very similar.
Mozart wrote over 40, but I am not sure anyone could accuse him of rewriting the same symphony.
Some lesser known early composers (1700s) wrote a large number of symphones (in the days when they were very short and just used as background music at parties)
Bruckner only wrote a few symphones, but he did keep rewriting them and republishing them in different forms during his life.
My guess is that it is a fairly obscure composer of the 1700s who wrote 50 or more symphones. Your guess is as good as mine.
If not then, and I have nothing to base this on, but would say Haydn as he is the most famous composer to write over 100 symphonies.