fit in vs fit into

fit in

verb
  • To be of a like type with others; to be socially accepted. 

  • To suit or conform to. 

  • Used other than figuratively or idiomatically: see fit, in. 

fit into

verb
  • To be of similar cultural or social status as the members of a group of people. 

  • To be of the right size and shape to be placed in a location. 

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