ΔE 12.6, fair: the same colour family, but not a straight swap. Olive Brown is a little lighter, more muted than Hull Red.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Olive Brown is a little lighter, more muted than Hull Red.
The same difference applies the other way round: Hull Red 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 Hull Red on the colour wheel See Olive Brown on the colour wheel
All matches: Hull Red equivalents · Olive Brown equivalents