ΔE 7.2, close: similar, with a visible difference side by side. Hemp BS4800/10B21 is a little darker, warmer than Potion Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Hemp BS4800/10B21 is a little darker, warmer than Potion Green.
The same difference applies the other way round: Potion Green is a little lighter, 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 Potion Green on the colour wheel See Hemp BS4800/10B21 on the colour wheel
All matches: Potion Green equivalents · Hemp BS4800/10B21 equivalents