Rootpath vs Stormvermin Fur

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Stormvermin Fur is a little lighter, more muted than Rootpath.

Can I use Stormvermin Fur instead of Rootpath?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Stormvermin Fur is a little lighter, more muted than Rootpath.

Can I use Rootpath instead of Stormvermin Fur?

The same difference applies the other way round: Rootpath 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.