ΔE 14.5, fair: the same colour family, but not a straight swap. Oily Steel is noticeably darker, more saturated than Blackened Steel.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Oily Steel is noticeably darker, more saturated than Blackened Steel.
The same difference applies the other way round: Blackened Steel is noticeably lighter, 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 Blackened Steel on the colour wheel See Oily Steel on the colour wheel
All matches: Blackened Steel equivalents · Oily Steel equivalents