ΔE 21.2, loose: different enough that you should pick on purpose. Ochre is more saturated, cooler than Ground Brown.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Ochre is more saturated, cooler than Ground Brown.
The same difference applies the other way round: Ground Brown is more muted, warmer.
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 Ground Brown on the colour wheel See Ochre on the colour wheel
All matches: Ground Brown equivalents · Ochre equivalents