ΔE 15.8, loose: different enough that you should pick on purpose. Gunmetal (Metal.) is noticeably lighter, more muted than Golden Moon.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Gunmetal (Metal.) is noticeably lighter, more muted than Golden Moon.
The same difference applies the other way round: Golden Moon is noticeably darker, more saturated.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Golden Moon on the colour wheel See Gunmetal (Metal.) on the colour wheel
All matches: Golden Moon equivalents · Gunmetal (Metal.) equivalents