ΔE 12.2, fair: the same colour family, but not a straight swap. Dark Reaper is a little lighter, more saturated than Oxford.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Reaper is a little lighter, more saturated than Oxford.
The same difference applies the other way round: Oxford is a little darker, more muted.
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 Oxford on the colour wheel See Dark Reaper on the colour wheel
All matches: Oxford equivalents · Dark Reaper equivalents