x-pve You're comparing to the wrong stock Pixel OS release. You used the one labelled BP1A.250305.020.A2, Mar 2025, EMEA + TW instead of BP1A.250305.020, Mar 2025.
It's intended? Do I have to flash GOS as is or is better to flash Google's radio partition?
GrapheneOS provides all of the firmware images as part of flashing the OS and provides the updates to them. Not doing that would be completely broken and insecure.