ΔE 11.4, fair: the same colour family, but not a straight swap. Ochre Brown is a little lighter, more muted than Half-Orc Highlight.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Ochre Brown is a little lighter, more muted than Half-Orc Highlight.
The same difference applies the other way round: Half-Orc Highlight is a little darker, more saturated.
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 Half-Orc Highlight on the colour wheel See Ochre Brown on the colour wheel
All matches: Half-Orc Highlight equivalents · Ochre Brown equivalents