ΔE 14.8, fair: the same colour family, but not a straight swap. Beetle Green is a little darker, warmer than Cold Open.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Beetle Green is a little darker, warmer than Cold Open.
The same difference applies the other way round: Cold Open is a little lighter, cooler.
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 Cold Open on the colour wheel See Beetle Green on the colour wheel
All matches: Cold Open equivalents · Beetle Green equivalents