Steel Helmet Green vs Dark Beige

How close are they?

ΔE 17.3, loose: different enough that you should pick on purpose. Dark Beige is a little lighter, warmer than Steel Helmet Green.

Can I use Dark Beige instead of Steel Helmet Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Dark Beige is a little lighter, warmer than Steel Helmet Green.

Can I use Steel Helmet Green instead of Dark Beige?

The same difference applies the other way round: Steel Helmet Green is a little darker, 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.