ΔE 9.2, close: similar, with a visible difference side by side. Light Phthalo Green is a little lighter, more saturated than Skyshard. They are different kinds of paint: Army Painter Skyshard 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.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Light Phthalo Green is a little lighter, more saturated than Skyshard. They are different kinds of paint.
The same difference applies the other way round: Skyshard is a little darker, 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 Skyshard on the colour wheel See Light Phthalo Green on the colour wheel
All matches: Skyshard equivalents · Light Phthalo Green equivalents