ΔE 13.9, fair: the same colour family, but not a straight swap. Phthalo Green (Blue Shade) is more muted, warmer than Sotek Green. They are different kinds of paint: Citadel Sotek Green is an opaque base/layer paint and Golden Phthalo Green (Blue Shade) is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Phthalo Green (Blue Shade) is more muted, warmer than Sotek Green. They are different kinds of paint.
The same difference applies the other way round: Sotek Green is more saturated, cooler.
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 Sotek Green on the colour wheel See Phthalo Green (Blue Shade) on the colour wheel
All matches: Sotek Green equivalents · Phthalo Green (Blue Shade) equivalents