ΔE 19.7, loose: different enough that you should pick on purpose. Plaguebearer Flesh is noticeably darker, more muted, warmer than Maggot Skin.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Plaguebearer Flesh is noticeably darker, more muted, warmer than Maggot Skin.
The same difference applies the other way round: Maggot Skin is noticeably lighter, more saturated, 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 Maggot Skin on the colour wheel See Plaguebearer Flesh on the colour wheel
All matches: Maggot Skin equivalents · Plaguebearer Flesh equivalents