ΔE 13.2, fair: the same colour family, but not a straight swap. Shadowed Green is a little darker, more muted, warmer than Greenskin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Shadowed Green is a little darker, more muted, warmer than Greenskin.
The same difference applies the other way round: Greenskin is a little lighter, more saturated, 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 Greenskin on the colour wheel See Shadowed Green on the colour wheel
All matches: Greenskin equivalents · Shadowed Green equivalents