ΔE 24.0, loose: different enough that you should pick on purpose. Emerald is a little darker, much more saturated, cooler than Bestial Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Emerald is a little darker, much more saturated, cooler than Bestial Green.
The same difference applies the other way round: Bestial Green is a little lighter, much more muted, 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 Bestial Green on the colour wheel See Emerald on the colour wheel
All matches: Bestial Green equivalents · Emerald equivalents