ΔE 10.0, fair: the same colour family, but not a straight swap. British Green is a little lighter, cooler than Caliban Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). British Green is a little lighter, cooler than Caliban Green.
The same difference applies the other way round: Caliban Green is a little darker, 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 Caliban Green on the colour wheel See British Green on the colour wheel
All matches: Caliban Green equivalents · British Green equivalents