ΔE 16.6, loose: different enough that you should pick on purpose. Poison Green is much more saturated, cooler than Stormvermin Fur.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Poison Green is much more saturated, cooler than Stormvermin Fur.
The same difference applies the other way round: Stormvermin Fur is much 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 Stormvermin Fur on the colour wheel See Poison Green on the colour wheel
All matches: Stormvermin Fur equivalents · Poison Green equivalents