ΔE 7.0, close: similar, with a visible difference side by side. Fern Green is more saturated, cooler than Elf Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Fern Green is more saturated, cooler than Elf Green.
The same difference applies the other way round: Elf Green is more muted, 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 Elf Green on the colour wheel See Fern Green on the colour wheel
All matches: Elf Green equivalents · Fern Green equivalents