I have two versions of Linux on 2 disks based on the same hardware (ie
same PC)

I have a single Disk with RedHat 9 installed with the default directory
structure.

I have a new disk (default directory structure) with Fedora FC3
(updates applied).
I would like to add my old redhat 9 disk to my fedora installation if
possible to move files to my new disk as required.

When I tried to add my old RH9 disk I got a problem with disk labels
due to a second "BOOT" label being found.
Are there other labels that will clash?

I'm a newbie with disks in Linux.
Any suggestions as to how to get around this problem?