Brazen Copper vs Ancient Gold

How close are they?

ΔE 27.2, loose: different enough that you should pick on purpose. Ancient Gold is a little lighter, more muted than Brazen Copper.

Can I use Ancient Gold instead of Brazen Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Ancient Gold is a little lighter, more muted than Brazen Copper.

Can I use Brazen Copper instead of Ancient Gold?

The same difference applies the other way round: Brazen Copper is a little 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.