Can I register my JReviews license key to a different site
From JReviews Documentation
Yes, to move the license you will need to reissue it. To do this first log in to the Client Area.
Click on View Your Licenses link on the left menu and then click on the View & Download button:
On the next page you'll find the Reissue License button:
After you click on the Reissue License button, you are free to enter the license number on a new domain (in JReviews administration).