If you have FusionReactor on a server, but wish to use this license on another server you can do so by deactivating FusionReactor on one server and applying the key to another.
To do this:
On the server you wish to deactivate, go to the about page on all instances and click deactivate
On the server you wish to activate, go to the about page and apply the license key
Note: server refers to the application server (Tomcat/ColdFusion/...), not FRAM