Ork Flesh vs Orc Skin

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Orc Skin is a little darker, more muted than Ork Flesh.

Can I use Orc Skin instead of Ork Flesh?

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

Can I use Ork Flesh instead of Orc Skin?

The same difference applies the other way round: Ork Flesh is a little lighter, more saturated.

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.