ΔE 11.5, fair: the same colour family, but not a straight swap. Speed Metal is noticeably lighter than Enchanted Steel.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Speed Metal is noticeably lighter than Enchanted Steel.
The same difference applies the other way round: Enchanted Steel is noticeably darker.
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 Speed Metal on the colour wheel
All matches: Enchanted Steel equivalents · Speed Metal equivalents