reskin vs spruce up

reskin

verb
  • To change the skin, or visual appearance, of an application. 

  • To replace the skin of a motor vehicle, especially so as to market the same car under different brands 

noun
  • Something that uses the exact same model as something else, but has superficial differences such as textures. 

spruce up

verb
  • To refresh, revamp; to freshen or improve something, especially its appearance. 

  • To dress or arrange smartly, elegantly, and neatly; to smarten. 

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