follow suit vs tread in someone's steps

follow suit

verb
  • To follow an example; to imitate or copy the actions of another. 

  • To play a card of the same suit as the previous or leading card. 

tread in someone's steps

verb
  • To follow someone's example; to behave as someone did. 

How often have the words follow suit and tread in someone's steps occurred in a corpus of books? (source: Google Ngram Viewer )