ΔE 10.9, fair: the same colour family, but not a straight swap. Green Grey is more muted, cooler than Thornwood Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Green Grey is more muted, cooler than Thornwood Green.
The same difference applies the other way round: Thornwood Green is 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 Thornwood Green on the colour wheel See Green Grey on the colour wheel
All matches: Thornwood Green equivalents · Green Grey equivalents