ΔE 25.6, loose: different enough that you should pick on purpose. Beetle Green is a little darker, much more muted, cooler than Twin Sons.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Beetle Green is a little darker, much more muted, cooler than Twin Sons.
The same difference applies the other way round: Twin Sons 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 Twin Sons on the colour wheel See Beetle Green on the colour wheel
All matches: Twin Sons equivalents · Beetle Green equivalents