Brass vs Aztec Gold

How close are they?

ΔE 17.6, loose: different enough that you should pick on purpose. Aztec Gold is a little darker, more saturated, cooler than Brass.

Can I use Aztec Gold instead of Brass?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Aztec Gold is a little darker, more saturated, cooler than Brass.

Can I use Brass instead of Aztec Gold?

The same difference applies the other way round: Brass is a little lighter, more muted, warmer.

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.