ΔE 12.6, fair: the same colour family, but not a straight swap. Foul Green is much more saturated than Amulet Aqua.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Foul Green is much more saturated than Amulet Aqua.
The same difference applies the other way round: Amulet Aqua is much more muted.
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 Amulet Aqua on the colour wheel See Foul Green on the colour wheel
All matches: Amulet Aqua equivalents · Foul Green equivalents