ΔE 13.8, fair: the same colour family, but not a straight swap. Plaguebearer Flesh is a little lighter, warmer than Rigor Mortis.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Plaguebearer Flesh is a little lighter, warmer than Rigor Mortis.
The same difference applies the other way round: Rigor Mortis is a little darker, 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 Rigor Mortis on the colour wheel See Plaguebearer Flesh on the colour wheel
All matches: Rigor Mortis equivalents · Plaguebearer Flesh equivalents