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