Catachan Flesh vs Oiled Leather

How close are they?

ΔE 7.3, close: similar, with a visible difference side by side. Oiled Leather is a little darker than Catachan Flesh.

Can I use Oiled Leather instead of Catachan Flesh?

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

Can I use Catachan Flesh instead of Oiled Leather?

The same difference applies the other way round: Catachan Flesh 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.