ΔE 10.2, fair: the same colour family, but not a straight swap. Fern Green is more muted, cooler than AMT-4 (A-24m) Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Fern Green is more muted, cooler than AMT-4 (A-24m) Green.
The same difference applies the other way round: AMT-4 (A-24m) Green is more saturated, 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 AMT-4 (A-24m) Green on the colour wheel See Fern Green on the colour wheel
All matches: AMT-4 (A-24m) Green equivalents · Fern Green equivalents