ΔE 27.0, loose: different enough that you should pick on purpose. Beetle Green is a little darker, much more muted, cooler than Emerald Metallic Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Beetle Green is a little darker, much more muted, cooler than Emerald Metallic Green.
The same difference applies the other way round: Emerald Metallic Green is a little lighter, much more saturated, 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 Emerald Metallic Green on the colour wheel See Beetle Green on the colour wheel
All matches: Emerald Metallic Green equivalents · Beetle Green equivalents