ΔE 19.1, loose: different enough that you should pick on purpose. Starship Steel is noticeably lighter, more saturated than Shadowed Steel.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Starship Steel is noticeably lighter, more saturated than Shadowed Steel.
The same difference applies the other way round: Shadowed Steel is noticeably 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 Shadowed Steel on the colour wheel See Starship Steel on the colour wheel
All matches: Shadowed Steel equivalents · Starship Steel equivalents