Thallax Gold vs El Dorado

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. El Dorado is a little lighter, more saturated than Thallax Gold.

Can I use El Dorado instead of Thallax Gold?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). El Dorado is a little lighter, more saturated than Thallax Gold.

Can I use Thallax Gold instead of El Dorado?

The same difference applies the other way round: Thallax Gold 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.