ΔE 12.7, fair: the same colour family, but not a straight swap. Old Bronze is more saturated, cooler than Warplock Bronze.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Old Bronze is more saturated, cooler than Warplock Bronze.
The same difference applies the other way round: Warplock Bronze is more muted, 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 Warplock Bronze on the colour wheel See Old Bronze on the colour wheel
All matches: Warplock Bronze equivalents · Old Bronze equivalents