Earth Brown vs Golden Brown

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Golden Brown is a little lighter, more saturated than Earth Brown.

Can I use Golden Brown instead of Earth Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Golden Brown is a little lighter, more saturated than Earth Brown.

Can I use Earth Brown instead of Golden Brown?

The same difference applies the other way round: Earth Brown 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.