ΔE 7.3, close: similar, with a visible difference side by side. Primer Red Oxide is a little lighter than Blood for the Blood God.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Primer Red Oxide is a little lighter than Blood for the Blood God.
The same difference applies the other way round: Blood for the Blood God is a little darker.
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 for the Blood God on the colour wheel See Primer Red Oxide on the colour wheel
All matches: Blood for the Blood God equivalents · Primer Red Oxide equivalents