ΔE 11.2, fair: the same colour family, but not a straight swap. Bronze is a little darker, cooler than Dark Iron.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Bronze is a little darker, cooler than Dark Iron.
The same difference applies the other way round: Dark Iron is a little lighter, warmer.
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 Dark Iron on the colour wheel See Bronze on the colour wheel
All matches: Dark Iron equivalents · Bronze equivalents