Blood Moon Red vs Astorath Red

How close are they?

ΔE 7.1, close: similar, with a visible difference side by side. Astorath Red is a little darker than Blood Moon Red.

Can I use Astorath Red instead of Blood Moon Red?

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

Can I use Blood Moon Red instead of Astorath Red?

The same difference applies the other way round: Blood Moon Red is a little lighter.

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.