If you have installed both versions of Fedora on different drives one by one and now want to list both at boot time for selection. then connect both to your computer and startup. Once you get to a login menu of any one of the OS's login and switch to root and type grub2-update or grup2. Don't remember the exact commad. It will update the grup config file and automatically update the entries for the other OS on the second drive.
Cheers!!
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