ΔE 15.8, loose: different enough that you should pick on purpose. T'au Light Ochre is a little darker, more muted, warmer than Light Brick.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). T'au Light Ochre is a little darker, more muted, warmer than Light Brick.
The same difference applies the other way round: Light Brick is a little lighter, more saturated, cooler.
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.
See Light Brick on the colour wheel See T'au Light Ochre on the colour wheel
All matches: Light Brick equivalents · T'au Light Ochre equivalents