They are simply extra packages - you could install those using pacman or Pamac and get the same result.
Bash snippet to list the >extra packages - replace EDITION with e.g. gnome or xfce
EDITION="kde"
URL="https://gitlab.manjaro.org/profiles-and-settings/iso-profiles/-/raw/master/manjaro/${EDITION}/Packages-Desktop"
echo $(curl "${URL}" | grep -E "^>extra")
One example is print support which is a meta package pulling everything print related