ΔE 14.6, fair: the same colour family, but not a straight swap. Runelord Brass is noticeably darker, cooler than Bronze.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Runelord Brass is noticeably darker, cooler than Bronze.
The same difference applies the other way round: Bronze is noticeably 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 Bronze on the colour wheel See Runelord Brass on the colour wheel
All matches: Bronze equivalents · Runelord Brass equivalents