differ vs personate

differ

verb
  • Not to have the same traits or characteristics; to be unalike or distinct. 

  • To have diverging opinions, disagree. 

  • To be separated in quantity. 

noun
  • A program that diffs, a diff. 

personate

verb
  • To fraudulently portray another person; to impersonate. 

  • To portray a character (as in a play); to act. 

  • To attribute personal characteristics to something; to personify. 

  • To set forth in an unreal character; to disguise; to mask. 

adj
  • Having the throat of a corolla nearly closed by a projection of the base of the lower lip (in a way reminiscent of a mask), as in the flower of the snapdragon. 

How often have the words differ and personate occurred in a corpus of books? (source: Google Ngram Viewer )