I'm using Microsoft Word 2002 to maintain some documentation. The documents are stored in a version control repository (Subversion) together with the source code it documents. My Subversion client (TortoiseSVN) comes with a little VBA script that allows to leverage the built-in revisions feature when merging different branches. In other words, when I want to copy changes from one document to another, Word compares both documents (source and target) and builds a third document that has the contents of the source doc tagged as revisions, so I can then review differences one by one and confirm or discard changes.

While this is handy, it also means that making a single change to the source document forces me to review all the differences between both documents and discard all of them except the only actual change.

My questions is... Do you know about an application or plug-in that's able to find the differences between two Word documents and apply those differences to a third document?

(I know 2002 is very old but that's what my company gives me; I'm open to solutions that use newer versions though.)