True Copper vs Antique Gold

How close are they?

ΔE 29.7, loose: different enough that you should pick on purpose. Antique Gold is noticeably lighter, more saturated, cooler than True Copper.

Can I use Antique Gold instead of True Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 30). Antique Gold is noticeably lighter, more saturated, cooler than True Copper.

Can I use True Copper instead of Antique Gold?

The same difference applies the other way round: True Copper is noticeably darker, 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.