Feral Green vs Hemp BS4800/10B21

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. Hemp BS4800/10B21 is a little darker, more muted than Feral Green.

Can I use Hemp BS4800/10B21 instead of Feral Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Hemp BS4800/10B21 is a little darker, more muted than Feral Green.

Can I use Feral Green instead of Hemp BS4800/10B21?

The same difference applies the other way round: Feral Green is a little lighter, more saturated.

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.