ΔE 12.0, fair: the same colour family, but not a straight swap. Orc Skin is a little lighter, warmer than Green Ghost.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Orc Skin is a little lighter, warmer than Green Ghost.
The same difference applies the other way round: Green Ghost is a little darker, 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 Green Ghost on the colour wheel See Orc Skin on the colour wheel
All matches: Green Ghost equivalents · Orc Skin equivalents