ΔE 11.3, fair: the same colour family, but not a straight swap. Kawa Brown is a little darker, warmer than Nº6 Earth Yellow (FS30257).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Kawa Brown is a little darker, warmer than Nº6 Earth Yellow (FS30257).
The same difference applies the other way round: Nº6 Earth Yellow (FS30257) is a little lighter, 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 Nº6 Earth Yellow (FS30257) on the colour wheel See Kawa Brown on the colour wheel
All matches: Nº6 Earth Yellow (FS30257) equivalents · Kawa Brown equivalents