ΔE 7.5, close: similar, with a visible difference side by side. Diarylide Yellow is a little lighter than Phalanx Yellow. They are different kinds of paint: Citadel Phalanx Yellow is an opaque base/layer paint and Golden Diarylide Yellow is an ink, glaze or transparent 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). Diarylide Yellow is a little lighter than Phalanx Yellow. They are different kinds of paint.
The same difference applies the other way round: Phalanx Yellow is a little darker.
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 Phalanx Yellow on the colour wheel See Diarylide Yellow on the colour wheel
All matches: Phalanx Yellow equivalents · Diarylide Yellow equivalents