The 15.3.Rel2 arm-none-eabi toolchains on GitLab report the wrong package version string.
$ arm-none-eabi-gcc --version arm-none-eabi-gcc (Arm GNU Toolchain 15.3.Rel1 (Build arm-15.149)) 15.3.1 20260627 Copyright (C) 2025 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The original 15.3.Rel1 release reports Build arm-15.149, so only the build number tells the two releases apart.