ΔE 17.5, loose: different enough that you should pick on purpose. Green Brown is a little darker, more muted, cooler than Kiwi Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Green Brown is a little darker, more muted, cooler than Kiwi Brown.
The same difference applies the other way round: Kiwi Brown is a little lighter, more saturated, 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 Kiwi Brown on the colour wheel See Green Brown on the colour wheel
All matches: Kiwi Brown equivalents · Green Brown equivalents