Yes, you just need to run the installation wizard and add the licenses that you intend to use in the licensed version. The database and catalogs remain unaffected. The only problem will be with backup jobs which use a specific agent for which you have not added the license. Those jobs may need to be reconfigured based on available license.

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Thanks

Or...Use the Tools --> Install Options and License Keys on this Media Server... option in Backup Exec itself.
It will pop up a splash screen, and the first page is the option to install your license keys. This will be quicker than running through the installation process again.
For good measure I'd push my RAWS agents out to the clients again.