Golden Yellow vs Fiendish Yellow

How close are they?

ΔE 7.1, close: similar, with a visible difference side by side. Fiendish Yellow is a little darker, more muted than Golden Yellow.

Can I use Fiendish Yellow instead of Golden Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Fiendish Yellow is a little darker, more muted than Golden Yellow.

Can I use Golden Yellow instead of Fiendish Yellow?

The same difference applies the other way round: Golden Yellow is a little lighter, more saturated.

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.