Morghast Bone vs Vampire Fang

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Vampire Fang is more muted, warmer than Morghast Bone.

Can I use Vampire Fang instead of Morghast Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Vampire Fang is more muted, warmer than Morghast Bone.

Can I use Morghast Bone instead of Vampire Fang?

The same difference applies the other way round: Morghast Bone 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.