Cold Steel vs Beetle Green

How close are they?

ΔE 28.2, loose: different enough that you should pick on purpose. Beetle Green is much more saturated, warmer than Cold Steel.

Can I use Beetle Green instead of Cold Steel?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Beetle Green is much more saturated, warmer than Cold Steel.

Can I use Cold Steel instead of Beetle Green?

The same difference applies the other way round: Cold Steel is much more muted, 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.