Red Copper vs Arcane Gold

How close are they?

ΔE 18.8, loose: different enough that you should pick on purpose. Arcane Gold is a little darker, more muted, warmer than Red Copper.

Can I use Arcane Gold instead of Red Copper?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Arcane Gold is a little darker, more muted, warmer than Red Copper.

Can I use Red Copper instead of Arcane Gold?

The same difference applies the other way round: Red Copper is a little lighter, more saturated, 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.