ΔE 13.2, fair: the same colour family, but not a straight swap. Phthalo Blue (Green Shade) is a little lighter, more saturated, warmer than Leviadon Blue. They are different kinds of paint: Citadel Leviadon Blue is a one-coat contrast-style paint and Golden Phthalo Blue (Green 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 13). Phthalo Blue (Green Shade) is a little lighter, more saturated, warmer than Leviadon Blue. They are different kinds of paint.
The same difference applies the other way round: Leviadon Blue is a little darker, more muted, 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 Leviadon Blue on the colour wheel See Phthalo Blue (Green Shade) on the colour wheel
All matches: Leviadon Blue equivalents · Phthalo Blue (Green Shade) equivalents