Worn Stone vs Vampire Fang

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Vampire Fang is more saturated, warmer than Worn Stone.

Can I use Vampire Fang instead of Worn Stone?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Vampire Fang is more saturated, warmer than Worn Stone.

Can I use Worn Stone instead of Vampire Fang?

The same difference applies the other way round: Worn Stone is more muted, 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.