What is an OSB ISO? What's the difference of an OSB and a "normal" ISO?

What’s the difference between these two ISOs:
Fedora-Workstation-Live-osb-Rawhide-20240216.n.0.x86_64.iso and
Fedora-Workstation-Live-x86_64-Rawhide-20240216.n.0.iso

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Added fedora-rawhide, isoinfo, f40, #fedora-40

someone knews?

What I found while searching led to using osbuild to make the image. That being the case I would expect it to be identical to the other iso. I am still looking for the code to see what may be different.

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Yeah, the OSB one is 300MB bigger.

Actually, what happens right now during deploying KVM Guest via Fedora-Workstation-Live-osb-40-20240301.n.0.x86_64.iso :-
/* https://opencolo.mm.fcix.net/fedora/linux/development/40/Workstation/x86_64/iso/Fedora-Workstation-Live-osb-40-20240301.n.0.x86_64.iso
*/
At the time of writing I clearly saw Anconda Web UI behavior during installation via ISO image pointed above. However, it appears impossible to customize virtual disk layout. Every time EFI (/boot/efi, fat32) partition, BOOT partition (/boot, ext4), ROOT partition (btrfs,“/”) are supposed to be created, installer just configures BTRFS ROOT (“/”) parition in accordance with space proposed during virt-manager configuration phase.
If I select ordinary ISO image ( Fedora-Workstation-Live-x86_64-40-20240301.n.0.iso ) everything works fine in traditional manner , say utilizing pretty nice “Blivet GUI”.