Kobold Skin vs Resurrection Flesh

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Resurrection Flesh is a little darker than Kobold Skin.

Can I use Resurrection Flesh instead of Kobold Skin?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Resurrection Flesh is a little darker than Kobold Skin.

Can I use Kobold Skin instead of Resurrection Flesh?

The same difference applies the other way round: Kobold Skin 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.