be on same wavelength vs prove out

be on same wavelength

prove out

verb
  • To turn out to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

  • To demonstrate the feasibility of; to show or be shown to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

How often have the words be on same wavelength and prove out occurred in a corpus of books? (source: Google Ngram Viewer )