A quick and handy way to review two documents in Word 2016 is to arrange them side by side. Both documents are visible on the screen and their scrolling is locked so that you can peruse both in parallel. Here's how to accomplish this trick:
Open both documents.
On the View tab, in the Window group, click the View Side by Side button.
Word instantly arranges both documents in vertical windows, with the current document on the left and the other on the right.
Scroll either document.
Scrolling one document also scrolls the other. In this mode, you can compare two different or similar documents.
You can disable synchronous scrolling by clicking the Synchronous Scrolling button, found in the Window group.
When you're done, choose View Side by Side again.