ΔE 5.3, very close: most people won’t see a difference side by side. Yellow is more saturated than Phalanx Yellow. They are different kinds of paint: Citadel Phalanx Yellow is an opaque base/layer paint and Green Stuff World Yellow is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 5). Yellow is more saturated than Phalanx Yellow. They are different kinds of paint.
The same difference applies the other way round: Phalanx Yellow is 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.
See Phalanx Yellow on the colour wheel See Yellow on the colour wheel
All matches: Phalanx Yellow equivalents · Yellow equivalents