Dark Flesh vs T'au Light Ochre

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. T'au Light Ochre is noticeably darker, more muted than Dark Flesh.

Can I use T'au Light Ochre instead of Dark Flesh?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). T'au Light Ochre is noticeably darker, more muted than Dark Flesh.

Can I use Dark Flesh instead of T'au Light Ochre?

The same difference applies the other way round: Dark Flesh is noticeably 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.