Astorath Red vs Bloodstone

How close are they?

ΔE 20.1, loose: different enough that you should pick on purpose. Bloodstone is a little darker, more muted, warmer than Astorath Red.

Can I use Bloodstone instead of Astorath Red?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Bloodstone is a little darker, more muted, warmer than Astorath Red.

Can I use Astorath Red instead of Bloodstone?

The same difference applies the other way round: Astorath Red is a little lighter, 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.