Gloss Aluminum vs Copper (Metallic)

How close are they?

ΔE 7.2, close: similar, with a visible difference side by side. Copper (Metallic) is a little lighter, more saturated than Gloss Aluminum.

Can I use Copper (Metallic) instead of Gloss Aluminum?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Copper (Metallic) is a little lighter, more saturated than Gloss Aluminum.

Can I use Gloss Aluminum instead of Copper (Metallic)?

The same difference applies the other way round: Gloss Aluminum is a little darker, more muted.

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.