ΔE 9.1, close: similar, with a visible difference side by side. Phthalo Green (Yellow Shade) is a little lighter, cooler than Death World Forest. They are different kinds of paint: Citadel Death World Forest is an opaque base/layer paint and Golden Phthalo Green (Yellow Shade) 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 9). Phthalo Green (Yellow Shade) is a little lighter, cooler than Death World Forest. They are different kinds of paint.
The same difference applies the other way round: Death World Forest is a little darker, warmer.
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 Death World Forest on the colour wheel See Phthalo Green (Yellow Shade) on the colour wheel
All matches: Death World Forest equivalents · Phthalo Green (Yellow Shade) equivalents