Noble Skin vs Ork Flesh

How close are they?

ΔE 16.5, loose: different enough that you should pick on purpose. Ork Flesh is a little darker, more saturated, cooler than Noble Skin.

Can I use Ork Flesh instead of Noble Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Ork Flesh is a little darker, more saturated, cooler than Noble Skin.

Can I use Noble Skin instead of Ork Flesh?

The same difference applies the other way round: Noble Skin is a little lighter, 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.