ΔE 8.0, close: similar, with a visible difference side by side. Nazdreg Yellow is more muted than RLM 04. They are different kinds of paint: AK Interactive RLM 04 is an opaque base/layer paint and Citadel Nazdreg Yellow is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Nazdreg Yellow is more muted than RLM 04. They are different kinds of paint.
The same difference applies the other way round: RLM 04 is 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.
See RLM 04 on the colour wheel See Nazdreg Yellow on the colour wheel
All matches: RLM 04 equivalents · Nazdreg Yellow equivalents