ΔE 29.2, loose: different enough that you should pick on purpose. Radiant Platinum is noticeably lighter, more saturated than Iron Hands Steel.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Radiant Platinum is noticeably lighter, more saturated than Iron Hands Steel.
The same difference applies the other way round: Iron Hands 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 Iron Hands Steel on the colour wheel See Radiant Platinum on the colour wheel
All matches: Iron Hands Steel equivalents · Radiant Platinum equivalents