Emperor Gold vs Ancient Bronze

How close are they?

ΔE 7.6, close: similar, with a visible difference side by side. Ancient Bronze is a little lighter, warmer than Emperor Gold.

Can I use Ancient Bronze instead of Emperor Gold?

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

Can I use Emperor Gold instead of Ancient Bronze?

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