ΔE 14.0, fair: the same colour family, but not a straight swap. Mournfang Brown is noticeably darker, warmer than Shadow Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Mournfang Brown is noticeably darker, warmer than Shadow Flesh.
The same difference applies the other way round: Shadow Flesh is noticeably lighter, cooler.
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 Shadow Flesh on the colour wheel See Mournfang Brown on the colour wheel
All matches: Shadow Flesh equivalents · Mournfang Brown equivalents