YMDC is meant for discussions on how rules actually work.
Discussing why some units have options that others don't would be better kept to 40K General Discussion or Background.
As for the actual question, I would suspect that the difference in options is largely for flavour reasons. If both units had the same options, there would be no point having them both in the codex.
Command Squads get the wider options because they represent squads drawn from any of the different Companies, whereas Honour Guard are filling a more specialised role and are equipped to suit.
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