ΔE 6.4, close: similar, with a visible difference side by side. Opal Skin is a little lighter, warmer than Dead Magenta.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Opal Skin is a little lighter, warmer than Dead Magenta.
The same difference applies the other way round: Dead Magenta is a little darker, cooler.
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 Dead Magenta on the colour wheel See Opal Skin on the colour wheel
All matches: Dead Magenta equivalents · Opal Skin equivalents