Iron Warriors vs Magnesium

How close are they?

ΔE 29.4, loose: different enough that you should pick on purpose. Magnesium is noticeably lighter, more muted than Iron Warriors.

Can I use Magnesium instead of Iron Warriors?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 29). Magnesium is noticeably lighter, more muted than Iron Warriors.

Can I use Iron Warriors instead of Magnesium?

The same difference applies the other way round: Iron Warriors 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.