ΔE 13.1, fair: the same colour family, but not a straight swap. Abaddon Black is noticeably darker, more muted than Oil Stains.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Abaddon Black is noticeably darker, more muted than Oil Stains.
The same difference applies the other way round: Oil Stains is noticeably lighter, 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 Oil Stains on the colour wheel See Abaddon Black on the colour wheel
All matches: Oil Stains equivalents · Abaddon Black equivalents