Depends what depot the Guard is based at.
Staines, Guildford & Woking commercials / non commercials sign the same routes regardless of grade for their depots. So Woking non commercials still sign Pompey/Alton etc along with metro.
However Waterloo non commercial only sign metro routes (Waterloo-Guildford/Chessington/Hampton Court/Dorking/Reading/Windsor/Shepperton etc)
where as Waterloo commercial some links sign all of the above and Alton/Basingstoke/Pompey/Poole/Salisbury etc.
Down to what depot really.
Waterloo Commercial Guards still have duties which involve metro work / windsor side work.