ΔE 11.8, fair: the same colour family, but not a straight swap. Warp Lightning is more saturated, warmer than Pacific Green. They are different kinds of paint: AMMO by Mig Pacific Green is an opaque base/layer paint and Citadel Warp Lightning is a one-coat contrast-style 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 12). Warp Lightning is more saturated, warmer than Pacific Green. They are different kinds of paint.
The same difference applies the other way round: Pacific Green is 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 Pacific Green on the colour wheel See Warp Lightning on the colour wheel
All matches: Pacific Green equivalents · Warp Lightning equivalents