ΔE 11.6, fair: the same colour family, but not a straight swap. T'au Light Ochre is noticeably lighter than Barren Yellow.
Can I use T'au Light Ochre instead of Barren Yellow?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). T'au Light Ochre is noticeably lighter than Barren Yellow.
Can I use Barren Yellow instead of T'au Light Ochre?
The same difference applies the other way round: Barren Yellow is noticeably darker.
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.