ΔE 15.3, loose: different enough that you should pick on purpose. Thar Brown is a little lighter, much more muted, cooler than Telogreika Ochre.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Thar Brown is a little lighter, much more muted, cooler than Telogreika Ochre.
The same difference applies the other way round: Telogreika Ochre is a little darker, much more saturated, 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 Telogreika Ochre on the colour wheel See Thar Brown on the colour wheel
All matches: Telogreika Ochre equivalents · Thar Brown equivalents