ΔE 7.5, close: similar, with a visible difference side by side. Naphthol Red Medium is a little darker than Bloodmoon Red. They are different kinds of paint: Army Painter Bloodmoon Red is a one-coat contrast-style paint and Golden Naphthol Red Medium is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Naphthol Red Medium is a little darker than Bloodmoon Red. They are different kinds of paint.
The same difference applies the other way round: Bloodmoon 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 Bloodmoon Red on the colour wheel See Naphthol Red Medium on the colour wheel
All matches: Bloodmoon Red equivalents · Naphthol Red Medium equivalents