Black Metal vs Brazen Copper

How close are they?

ΔE 29.4, loose: different enough that you should pick on purpose. Brazen Copper is a little lighter, much more saturated, warmer than Black Metal.

Can I use Brazen Copper instead of Black Metal?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Brazen Copper is a little lighter, much more saturated, warmer than Black Metal.

Can I use Black Metal instead of Brazen Copper?

The same difference applies the other way round: Black Metal is a little darker, 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.