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