ΔE 14.4, fair: the same colour family, but not a straight swap. Gauss Blaster Green is more saturated, cooler than Forest Faun.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Gauss Blaster Green is more saturated, cooler than Forest Faun.
The same difference applies the other way round: Forest Faun 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 Forest Faun on the colour wheel See Gauss Blaster Green on the colour wheel
All matches: Forest Faun equivalents · Gauss Blaster Green equivalents