ΔE 10.1, fair: the same colour family, but not a straight swap. Leather Brown is more saturated, cooler than Medium Flesh Tone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Leather Brown is more saturated, cooler than Medium Flesh Tone.
The same difference applies the other way round: Medium Flesh Tone 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 Medium Flesh Tone on the colour wheel See Leather Brown on the colour wheel
All matches: Medium Flesh Tone equivalents · Leather Brown equivalents