Basic Skin Tone vs Kobold Skin

How close are they?

ΔE 6.4, close: similar, with a visible difference side by side. Kobold Skin is a little lighter, warmer than Basic Skin Tone.

Can I use Kobold Skin instead of Basic Skin Tone?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Kobold Skin is a little lighter, warmer than Basic Skin Tone.

Can I use Basic Skin Tone instead of Kobold Skin?

The same difference applies the other way round: Basic Skin Tone 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.