IDF Sand Grey 1970s-1980s vs Stormvermin Fur

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Stormvermin Fur is more muted, warmer than IDF Sand Grey 1970s-1980s.

Can I use Stormvermin Fur instead of IDF Sand Grey 1970s-1980s?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Stormvermin Fur is more muted, warmer than IDF Sand Grey 1970s-1980s.

Can I use IDF Sand Grey 1970s-1980s instead of Stormvermin Fur?

The same difference applies the other way round: IDF Sand Grey 1970s-1980s is more saturated, 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.