ΔE 12.8, fair: the same colour family, but not a straight swap. Parasite Brown is noticeably lighter than Leather Brown.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Parasite Brown is noticeably lighter than Leather Brown.
The same difference applies the other way round: Leather Brown is noticeably darker.
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 Leather Brown on the colour wheel See Parasite Brown on the colour wheel
All matches: Leather Brown equivalents · Parasite Brown equivalents