ΔE 5.5, very close: most people won’t see a difference side by side. Skeleton Horde is warmer than Rotten Flesh. They are different kinds of paint: AMMO by Mig Rotten Flesh is an opaque base/layer paint and Citadel Skeleton Horde is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 6). Skeleton Horde is warmer than Rotten Flesh. They are different kinds of paint.
The same difference applies the other way round: Rotten Flesh is 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 Rotten Flesh on the colour wheel See Skeleton Horde on the colour wheel
All matches: Rotten Flesh equivalents · Skeleton Horde equivalents