ΔE 18.2, loose: different enough that you should pick on purpose. Starship Steel is a little lighter, cooler than Bronzegrun.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Starship Steel is a little lighter, cooler than Bronzegrun.
The same difference applies the other way round: Bronzegrun is a little darker, warmer.
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 Bronzegrun on the colour wheel See Starship Steel on the colour wheel
All matches: Bronzegrun equivalents · Starship Steel equivalents