ΔE 14.2, fair: the same colour family, but not a straight swap. Base Flesh is noticeably lighter, more saturated than Tanned Leather.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Base Flesh is noticeably lighter, more saturated than Tanned Leather.
The same difference applies the other way round: Tanned Leather is noticeably darker, more muted.
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 Tanned Leather on the colour wheel See Base Flesh on the colour wheel
All matches: Tanned Leather equivalents · Base Flesh equivalents