Sunny Skin Tone vs T'au Light Ochre

How close are they?

ΔE 14.6, fair: the same colour family, but not a straight swap. T'au Light Ochre is noticeably darker, cooler than Sunny Skin Tone.

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

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). T'au Light Ochre is noticeably darker, cooler than Sunny Skin Tone.

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

The same difference applies the other way round: Sunny Skin Tone is noticeably lighter, 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.