ΔE 12.7, fair: the same colour family, but not a straight swap. Pastel Green is warmer than Hemp BS4800/10B21.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Pastel Green is warmer than Hemp BS4800/10B21.
The same difference applies the other way round: Hemp BS4800/10B21 is 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 Hemp BS4800/10B21 on the colour wheel See Pastel Green on the colour wheel
All matches: Hemp BS4800/10B21 equivalents · Pastel Green equivalents