Gauss Green vs Ordic Olive

How close are they?

ΔE 35.4, loose: different enough that you should pick on purpose. Ordic Olive is noticeably darker, much more muted, warmer than Gauss Green.

Can I use Ordic Olive instead of Gauss Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Ordic Olive is noticeably darker, much more muted, warmer than Gauss Green.

Can I use Gauss Green instead of Ordic Olive?

The same difference applies the other way round: Gauss Green is noticeably lighter, much more saturated, 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.