Sunburned Skin vs T'au Light Ochre

How close are they?

ΔE 21.5, loose: different enough that you should pick on purpose. T'au Light Ochre is noticeably darker, more saturated, cooler than Sunburned Skin.

Can I use T'au Light Ochre instead of Sunburned Skin?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). T'au Light Ochre is noticeably darker, more saturated, cooler than Sunburned Skin.

Can I use Sunburned Skin instead of T'au Light Ochre?

The same difference applies the other way round: Sunburned Skin is noticeably 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.