ΔE 9.0, close: similar, with a visible difference side by side. Thornwood Green is a little lighter, more muted than Steel Helmet Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Thornwood Green is a little lighter, more muted than Steel Helmet Green.
The same difference applies the other way round: Steel Helmet Green is a little darker, more saturated.
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 Steel Helmet Green on the colour wheel See Thornwood Green on the colour wheel
All matches: Steel Helmet Green equivalents · Thornwood Green equivalents