Compares the current document with a document that you select. The contents of the selected document are marked as deletions in the dialogue box that opens. If you want, you can insert the contents of the selected file into the current document by selecting the relevant deleted entries, clicking Reject, and then clicking Insert.
Choose Edit - Track Changes - Compare Document.
On the Track Changes toolbar, click
Compare Document
Comparing Versions of a Document
The contents of footnotes, headers, frames and fields are ignored.