Wagner's version of Beethoven's 5th Symphony

Is it Symphony in C major?

https://en.wikipedia.org/wiki/Richard_Wagner

"Instrumentation

The symphony is scored for 2 flutes, 2 oboes, 2 clarinets in C, 2 bassoons, contrabassoon, 4 horns in C, 2 trumpets in C, 3 trombones, timpani and strings.

Composition

According to Wagner himself, in a letter to a friend, he composed the symphony in the brief space of six weeks at the beginning of the summer of 1832. The composition shows the influence of the symphonies of Beethoven (especially nos. 3, 5 and 7) and also of the late symphonies of Mozart."

Could you have meant Mahler?

http://ams-sw.org/Proceedings/AMS-SW_V2Spring2013Barry.pdf

"Arguably, Mahler had used Beethoven’s 5th as a model for his 2nd symphony – also a taut, C minor work - and his 5th symphony, whose peremptory opening trumpet gesture duplicates almost exactly the famous motto of Beethoven’s 5th."