ΔE 8.2, close: similar, with a visible difference side by side. Savage Green is a little lighter, more saturated than Fern Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Savage Green is a little lighter, more saturated than Fern Green.
The same difference applies the other way round: Fern Green is a little darker, more muted.
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 Fern Green on the colour wheel See Savage Green on the colour wheel
All matches: Fern Green equivalents · Savage Green equivalents