ΔE 17.3, loose: different enough that you should pick on purpose. Hemp BS4800/10B21 is a little lighter, much more muted, warmer than Kabalite Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Hemp BS4800/10B21 is a little lighter, much more muted, warmer than Kabalite Green.
The same difference applies the other way round: Kabalite Green is a little darker, much more saturated, 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 Kabalite Green on the colour wheel See Hemp BS4800/10B21 on the colour wheel
All matches: Kabalite Green equivalents · Hemp BS4800/10B21 equivalents