Blood Red vs Dragon Red

How close are they?

ΔE 8.7, close: similar, with a visible difference side by side. Dragon Red is a little darker, cooler than Blood Red.

Can I use Dragon Red instead of Blood Red?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Dragon Red is a little darker, cooler than Blood Red.

Can I use Blood Red instead of Dragon Red?

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

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.