ΔE 8.8, close: similar, with a visible difference side by side. Forest Green is more saturated, cooler than Elf Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Forest 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 Forest Green on the colour wheel
All matches: Elf Green equivalents · Forest Green equivalents