ΔE 9.8, close: similar, with a visible difference side by side. Brown Violet RLM81 is a little darker, more muted than Stormvermin Fur.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Brown Violet RLM81 is a little darker, more muted than Stormvermin Fur.
The same difference applies the other way round: Stormvermin Fur is a little lighter, more saturated.
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 Brown Violet RLM81 on the colour wheel
All matches: Stormvermin Fur equivalents · Brown Violet RLM81 equivalents