ΔE 11.5, fair: the same colour family, but not a straight swap. Field Green is a little darker, warmer than Feral Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Field Green is a little darker, warmer than Feral Green.
The same difference applies the other way round: Feral Green is a little lighter, cooler.
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 Field Green on the colour wheel
All matches: Feral Green equivalents · Field Green equivalents