ΔE 12.7, fair: the same colour family, but not a straight swap. Amber Green is more saturated, warmer than Forrest Flux.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Amber Green is more saturated, warmer than Forrest Flux.
The same difference applies the other way round: Forrest Flux is more muted, 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 Forrest Flux on the colour wheel See Amber Green on the colour wheel
All matches: Forrest Flux equivalents · Amber Green equivalents