ΔE 6.4, close: similar, with a visible difference side by side. Olive Drab 1 is a little darker than Prairie Ochre.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Olive Drab 1 is a little darker than Prairie Ochre.
The same difference applies the other way round: Prairie Ochre is a little lighter.
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 Prairie Ochre on the colour wheel See Olive Drab 1 on the colour wheel
All matches: Prairie Ochre equivalents · Olive Drab 1 equivalents