ΔE 10.3, fair: the same colour family, but not a straight swap. Dwarven Iron is a little lighter than Iron Warriors.
✓ Two Thin Coats comparison chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dwarven Iron is a little lighter than Iron Warriors.
The same difference applies the other way round: Iron Warriors is a little darker.
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 Warriors on the colour wheel See Dwarven Iron on the colour wheel
All matches: Iron Warriors equivalents · Dwarven Iron equivalents