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SUSE GRUB is heavily patched to support the unique layout used for Btrfs by default. Those patches aren't upstream and aren't in Fedora. You're best off doing it the other way around, with SUSE GRUB booting Fedora. It might be possible to add to Fedora 40_custom or 41_custom, a menu entry that uses configfile command to point to the SUSE grub.cfg. But I'm not certain the SUSE grub.cfg will be interpreted correctly by Fedora GRUB. The format is the same, but the handling of Btrfs subvolumes is totally different between the code bases. Of course you need to run grub2-mkconfig on Fedora once you edit anything in /etc/grub.d/