ΔE 21.9, loose: different enough that you should pick on purpose. Ruby Red is a little darker, more saturated, cooler than Kawa Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Ruby Red is a little darker, more saturated, cooler than Kawa Brown.
The same difference applies the other way round: Kawa Brown is a little lighter, 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 Ruby Red on the colour wheel
All matches: Kawa Brown equivalents · Ruby Red equivalents