The Collaborative International Dictionary
Much of a muchness
Muchness \Much"ness\, n. Greatness; extent. [Obs. or Colloq.]
The quantity and muchness of time which it filcheth.
--W. Whately.
Much of a muchness, much the same. [Colloq.] ``Men's men;
gentle or simple, they're much of a muchness.''
--G.
Eliot.
Wiktionary
much of a muchness
phr. (context idiomatic English) Of two or more things, having little difference of any significance between them.