ΔE 11.4, fair: the same colour family, but not a straight swap. Nocturne Green is a little lighter, more muted, cooler than Shadow Thorn.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Nocturne Green is a little lighter, more muted, cooler than Shadow Thorn.
The same difference applies the other way round: Shadow Thorn is a little darker, more saturated, 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 Shadow Thorn on the colour wheel See Nocturne Green on the colour wheel
All matches: Shadow Thorn equivalents · Nocturne Green equivalents