ΔE 11.7, fair: the same colour family, but not a straight swap. Tan is a little darker, warmer than Orcish Dermis.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Tan is a little darker, warmer than Orcish Dermis.
The same difference applies the other way round: Orcish Dermis is a little 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 Orcish Dermis on the colour wheel See Tan on the colour wheel
All matches: Orcish Dermis equivalents · Tan equivalents