After downloading the nixos Gnome iso Download Nix / NixOS | Nix & NixOS I checked its hash and compared with the hash given at the website https://releases.nixos.org/nixos/22.11/nixos-22.11.3955.7449971a3ec/nixos-gnome-22.11.3955.7449971a3ec-x86_64-linux.iso.sha256 but even the filenames are different.
The downloaded file vs the sha256 link:
nixos-gnome-22.11.3940.15b75800dce-x86_64-linux.iso
nixos-gnome-22.11.3955.7449971a3ec-x86_64-linux.iso
Meanwhile the hash of the Plasma verision of nixos-plasma5-22.11.3955.7449971a3ec-x86_64-linux.iso
is correct.