ΔE 26.7, loose: different enough that you should pick on purpose. Natural Steel is noticeably lighter, more muted than Deathless Metal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Natural Steel is noticeably lighter, more muted than Deathless Metal.
The same difference applies the other way round: Deathless Metal is noticeably darker, more saturated.
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 Deathless Metal on the colour wheel See Natural Steel on the colour wheel
All matches: Deathless Metal equivalents · Natural Steel equivalents