ΔE 11.7, fair: the same colour family, but not a straight swap. Greenskin is a little darker, more saturated, cooler than Orc Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Greenskin is a little darker, more saturated, cooler than Orc Flesh.
The same difference applies the other way round: Orc Flesh is a little lighter, more muted, warmer.
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 Orc Flesh on the colour wheel See Greenskin on the colour wheel
All matches: Orc Flesh equivalents · Greenskin equivalents