ΔE 9.7, close: similar, with a visible difference side by side. Scarlet is a little darker than Blood Moon Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Scarlet is a little darker than Blood Moon 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.
See Blood Moon Red on the colour wheel See Scarlet on the colour wheel
All matches: Blood Moon Red equivalents · Scarlet equivalents