Flayed One Flesh vs Kronos Flesh

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Kronos Flesh is more saturated, cooler than Flayed One Flesh.

Can I use Kronos Flesh instead of Flayed One Flesh?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Kronos Flesh is more saturated, cooler than Flayed One Flesh.

Can I use Flayed One Flesh instead of Kronos Flesh?

The same difference applies the other way round: Flayed One Flesh is more muted, warmer.

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.