Posted By: Staci Davidson
Date: December 31, 2015 at 2:19 am
This function only works if versioning is enabled for that document library and is not available in Office Web Apps. You need the full Word application for this.
Open the file from SharePoint in Edit mode.
Word will open and under the review tab you find a button called compare.
Just choose Specific version from the pull down menu and a list with the versions inside SharePoint is being displayed.
From here Word will take over and do the rest. Even if you choose to combine SharePoint will turn it in to a new version.
I had to barrow these images of the internet.