ΔE 10.8, fair: the same colour family, but not a straight swap. Mars Yellow is more saturated, cooler than Kawa Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Mars Yellow is more saturated, cooler than Kawa Brown.
The same difference applies the other way round: Kawa Brown is more muted, 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.
See Kawa Brown on the colour wheel See Mars Yellow on the colour wheel
All matches: Kawa Brown equivalents · Mars Yellow equivalents