ΔE 7.3, close: similar, with a visible difference side by side. Cam. Middle Brown is a little lighter, more saturated, warmer than Olive Drab 2314.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Cam. Middle Brown is a little lighter, more saturated, warmer than Olive Drab 2314.
The same difference applies the other way round: Olive Drab 2314 is a little darker, 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.
See Olive Drab 2314 on the colour wheel See Cam. Middle Brown on the colour wheel
All matches: Olive Drab 2314 equivalents · Cam. Middle Brown equivalents