ΔE 12.8, fair: the same colour family, but not a straight swap. Stormfang is more muted, cooler than Green Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Stormfang is more muted, cooler than Green Blue.
The same difference applies the other way round: Green Blue 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 Green Blue on the colour wheel See Stormfang on the colour wheel
All matches: Green Blue equivalents · Stormfang equivalents