Mud Brown vs Stormvermin Fur

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Stormvermin Fur is a little lighter, more muted than Mud Brown.

Can I use Stormvermin Fur instead of Mud Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Stormvermin Fur is a little lighter, more muted than Mud Brown.

Can I use Mud Brown instead of Stormvermin Fur?

The same difference applies the other way round: Mud Brown is a little darker, 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.