Zealot Yellow vs Nazdreg Yellow

How close are they?

ΔE 9.9, close: similar, with a visible difference side by side. Nazdreg Yellow is a little darker, more muted than Zealot Yellow.

Can I use Nazdreg Yellow instead of Zealot Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Nazdreg Yellow is a little darker, more muted than Zealot Yellow.

Can I use Zealot Yellow instead of Nazdreg Yellow?

The same difference applies the other way round: Zealot 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.