Dead Magenta vs Kobold Skin

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Kobold Skin is a little darker, warmer than Dead Magenta.

Can I use Kobold Skin instead of Dead Magenta?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Kobold Skin is a little darker, warmer than Dead Magenta.

Can I use Dead Magenta instead of Kobold Skin?

The same difference applies the other way round: Dead Magenta is a little lighter, 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.