T'au Light Ochre vs Bright Yellow Ochre

How close are they?

ΔE 13.6, fair: the same colour family, but not a straight swap. Bright Yellow Ochre is a little lighter, more muted, cooler than T'au Light Ochre.

Can I use Bright Yellow Ochre instead of T'au Light Ochre?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Bright Yellow Ochre is a little lighter, more muted, cooler than T'au Light Ochre.

Can I use T'au Light Ochre instead of Bright Yellow Ochre?

The same difference applies the other way round: T'au Light Ochre 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.