Antique Gold vs Gold Brown

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Gold Brown is a little lighter than Antique Gold.

Can I use Gold Brown instead of Antique Gold?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Gold Brown is a little lighter than Antique Gold.

Can I use Antique Gold instead of Gold Brown?

The same difference applies the other way round: Antique Gold is a little darker.

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.