ΔE 14.9, fair: the same colour family, but not a straight swap. Light Phthalo Green is much more saturated than White Scar. They are different kinds of paint: Citadel White Scar is an opaque base/layer paint and Golden Light Phthalo Green 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 15). Light Phthalo Green is much more saturated than White Scar. They are different kinds of paint.
The same difference applies the other way round: White Scar is much 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 White Scar on the colour wheel See Light Phthalo Green on the colour wheel
All matches: White Scar equivalents · Light Phthalo Green equivalents