ΔE 16.5, loose: different enough that you should pick on purpose. Parasite Brown is a little darker, more muted, warmer than Dark Ochre.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Parasite Brown is a little darker, more muted, warmer than Dark Ochre.
The same difference applies the other way round: Dark Ochre is a little lighter, 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.
See Dark Ochre on the colour wheel See Parasite Brown on the colour wheel
All matches: Dark Ochre equivalents · Parasite Brown equivalents