ΔE 12.9, fair: the same colour family, but not a straight swap. Grey Knights Steel is noticeably lighter, more muted than Enchanted Steel.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Grey Knights Steel is noticeably lighter, more muted than Enchanted Steel.
The same difference applies the other way round: Enchanted Steel is noticeably darker, 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 Enchanted Steel on the colour wheel See Grey Knights Steel on the colour wheel
All matches: Enchanted Steel equivalents · Grey Knights Steel equivalents