ΔE 13.5, fair: the same colour family, but not a straight swap. Tanned Shadow is a little lighter, more muted, cooler than Catachan Flesh.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Tanned Shadow is a little lighter, more muted, cooler than Catachan Flesh.
The same difference applies the other way round: Catachan Flesh is a little darker, more saturated, 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 Catachan Flesh on the colour wheel See Tanned Shadow on the colour wheel
All matches: Catachan Flesh equivalents · Tanned Shadow equivalents