ΔE 15.9, loose: different enough that you should pick on purpose. Emerald Green is more saturated, cooler than Feral Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Emerald Green is more saturated, cooler than Feral Green.
The same difference applies the other way round: Feral 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 Feral Green on the colour wheel See Emerald Green on the colour wheel
All matches: Feral Green equivalents · Emerald Green equivalents