ΔE 13.7, fair: the same colour family, but not a straight swap. Oily Steel is noticeably darker than Six Shooter.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Oily Steel is noticeably darker than Six Shooter.
The same difference applies the other way round: Six Shooter is noticeably lighter.
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 Six Shooter on the colour wheel See Oily Steel on the colour wheel
All matches: Six Shooter equivalents · Oily Steel equivalents