Copper vs Rusty Metal

How close are they?

ΔE 12.4, fair: the same colour family, but not a straight swap. Rusty Metal is more muted, warmer than Copper.

Can I use Rusty Metal instead of Copper?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Rusty Metal is more muted, warmer than Copper.

Can I use Copper instead of Rusty Metal?

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