change over vs reconstitute

change over

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

reconstitute

verb
  • to construct something anew, or in a different manner 

  • to add liquid to a concentrated or dehydrated food to return it to its original consistency 

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