Hi, I am unsure if you are able to run two products with the same serial number, I would be a little wary as the product is registered to Bang & Olufsen over the internet so it may cause issues if their server recognises two identical devices.
I too had problems with the internet radio database, I resolved this by opening the maintenance menu and selected 'Delete databases' I did this on the cloned hard drive just in case I messed something up, fortunately there was no problem and many radio stations that had stopped working became available.
The system does then perform a reindexing which can take many many hours, you can still use the system but it will be doing lots of work in the background (rebuilding MOTS etc).
Kind regards,
Craig