Olive Green vs Intermediate Green

How close are they?

ΔE 15.9, loose: different enough that you should pick on purpose. Intermediate Green is noticeably darker, more muted than Olive Green.

Can I use Intermediate Green instead of Olive Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Intermediate Green is noticeably darker, more muted than Olive Green.

Can I use Olive Green instead of Intermediate Green?

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

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.