change over vs conform

change over

verb
  • to convert to, to make a transition from one system to another 

conform

verb
  • To make similar in form or nature; to make suitable for a purpose; to adapt. 

  • To act in accordance with expectations; to behave in the manner of others, especially as a result of social pressure. 

  • To be in accordance with a set of specifications or regulations, or with a policy or guideline. 

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