ΔE 21.0, loose: different enough that you should pick on purpose. Beetle Green is more muted, cooler than Carapace Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Beetle Green is more muted, cooler than Carapace Green.
The same difference applies the other way round: Carapace Green is 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 Carapace Green on the colour wheel See Beetle Green on the colour wheel
All matches: Carapace Green equivalents · Beetle Green equivalents