Catachan Flesh vs Tan Earth

How close are they?

ΔE 15.5, loose: different enough that you should pick on purpose. Tan Earth is a little lighter, more muted, cooler than Catachan Flesh.

Can I use Tan Earth instead of Catachan Flesh?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Tan Earth is a little lighter, more muted, cooler than Catachan Flesh.

Can I use Catachan Flesh instead of Tan Earth?

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