ΔE 5.6, very close: most people won’t see a difference side by side. Walnut Brown is a little darker, warmer than Stormvermin Fur. They are different kinds of paint: Citadel Stormvermin Fur is an opaque base/layer paint and Green Stuff World Walnut Brown is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 6). Walnut Brown is a little darker, warmer than Stormvermin Fur. They are different kinds of paint.
The same difference applies the other way round: Stormvermin Fur is a little lighter, 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 Stormvermin Fur on the colour wheel See Walnut Brown on the colour wheel
All matches: Stormvermin Fur equivalents · Walnut Brown equivalents