Colin,
Yes, you can import the catalog/images information from 1 master server to another.
I recommend looking through your NBU 6 manual for information/directions on the 'bprecover' command.
Also, read Chapter 7 of the NBU 6 Troubleshooting guide: http://seer.entsupport.symantec.com/docs/279295.htm
Also, as h m points out, you could run into some problems if your tapes are labeled identically; I hope they aren't!