Quickly detect any differences between two documents. On the Review tab, in the Compare group, click the Compare button. Your choices are Compare or Combine. Either one will give you a look at the differences. However, Combine will allow you to generate a third document that gives you the opportunity to include differences by accepting them.
When you initially compare the documents, the screen may look a little busy. Feel free to close down panels that aren’t useful. You have the option to choose Show Source Documents or not with an active Combine on the screen.