Olive Shadow vs Cam. Middle Brown

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Cam. Middle Brown is more muted, warmer than Olive Shadow.

Can I use Cam. Middle Brown instead of Olive Shadow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Cam. Middle Brown is more muted, warmer than Olive Shadow.

Can I use Olive Shadow instead of Cam. Middle Brown?

The same difference applies the other way round: Olive Shadow is 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.