ΔE 14.0, fair: the same colour family, but not a straight swap. Beetle Green is noticeably lighter than Emerald Alchemy.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Beetle Green is noticeably lighter than Emerald Alchemy.
The same difference applies the other way round: Emerald Alchemy is noticeably darker.
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 Emerald Alchemy on the colour wheel See Beetle Green on the colour wheel
All matches: Emerald Alchemy equivalents · Beetle Green equivalents