ΔE 6.9, close: similar, with a visible difference side by side. Bloody Red is a little darker than Blood Red Skies.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Bloody Red is a little darker than Blood Red Skies.
The same difference applies the other way round: Blood Red Skies 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.
See Blood Red Skies on the colour wheel See Bloody Red on the colour wheel
All matches: Blood Red Skies equivalents · Bloody Red equivalents