ΔE 20.7, loose: different enough that you should pick on purpose. Emperor Gold is much more saturated, warmer than Black Metal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Emperor Gold is much more saturated, warmer than Black Metal.
The same difference applies the other way round: Black Metal is much more muted, cooler.
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 Black Metal on the colour wheel See Emperor Gold on the colour wheel
All matches: Black Metal equivalents · Emperor Gold equivalents