ΔE 15.5, loose: different enough that you should pick on purpose. Steel Grey is noticeably darker, cooler than Ice Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Steel Grey is noticeably darker, cooler than Ice Blue.
The same difference applies the other way round: Ice Blue is noticeably lighter, 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 Ice Blue on the colour wheel See Steel Grey on the colour wheel
All matches: Ice Blue equivalents · Steel Grey equivalents