ΔE 12.4, fair: the same colour family, but not a straight swap. Iron Warriors is noticeably lighter, more saturated than Death Metal.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Iron Warriors is noticeably lighter, more saturated than Death Metal.
The same difference applies the other way round: Death Metal 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 Death Metal on the colour wheel See Iron Warriors on the colour wheel
All matches: Death Metal equivalents · Iron Warriors equivalents