ΔE 10.5, fair: the same colour family, but not a straight swap. T'au Light Ochre is a little darker, more muted than Space Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). T'au Light Ochre is a little darker, more muted than Space Yellow.
The same difference applies the other way round: Space Yellow is a little lighter, more saturated.
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 Space Yellow on the colour wheel See T'au Light Ochre on the colour wheel
All matches: Space Yellow equivalents · T'au Light Ochre equivalents