Blood Thorn vs Wazdakka Red

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Wazdakka Red is a little darker, more muted than Blood Thorn.

Can I use Wazdakka Red instead of Blood Thorn?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Wazdakka Red is a little darker, more muted than Blood Thorn.

Can I use Blood Thorn instead of Wazdakka Red?

The same difference applies the other way round: Blood Thorn is a little lighter, 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.