Resizing partition with Fedora

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Hi.
I have 2 SSDs in my latop: one with Windows 11 and a second one with Fedora 40 KDE.

I want to try another Fedora-based Linux distro (Nobara specifically). I have a ton of free space on my Fedora SSD, and I’d like to shrink the Fedora (btrfs) partition, so I can install Nobara on the rest. However, I’d also like to be able to extend the partition back the way it’s now, if I end up staying with my current Fedora install. I mostly just want to test GPU passthrough and GNOME, so I can’t do this in a VM.

Is there any way to do this, without loosing my data?

Just to be safe, I’ll do a backup of my Fedora SSD with Clonezilla, but it would be nice if I didn’t have to use it.

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There is, depending on your skill set. If I were you, I would get a new SSD, pull out the Fedora SSD and install the new SSD in its place.

Save a copy of output from efibootmgr, if possible on paper. You may need it to restore it later.

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The issue probably would occur when both fedora and nobara try to use the same efi partition. The suggestion by @vekruse seems wise to me both to avoid data risk as well as to ensure no problems with booting later.