Steampunk Copper vs Glorious Gold

How close are they?

ΔE 9.9, close: similar, with a visible difference side by side. Glorious Gold is more muted than Steampunk Copper.

Can I use Glorious Gold instead of Steampunk Copper?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Glorious Gold is more muted than Steampunk Copper.

Can I use Steampunk Copper instead of Glorious Gold?

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