Yes
1. Go to review tab and click on compare.
2. Click Combine revisions from multiple authors
3. In Original document put the document that you sent out with no changes.
4. In Revised document add all the revised documents
5. Click OK

Do this for each one. Make sure each time you enter the name of each person so you know who made what change.

NOTE Word can store only one set of formatting changes at a time. Therefore, when you merge multiple documents, you may be prompted to decide whether you want to keep the formatting from the original document or use the formatting from the edited document. If you don't need to track formatting changes, you can clear the Formatting check box in the Compare and Merge Documents dialog box.