ΔE 14.5, fair: the same colour family, but not a straight swap. Old Copper is noticeably darker, warmer than Talos Bronze.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Old Copper is noticeably darker, warmer than Talos Bronze.
The same difference applies the other way round: Talos Bronze is noticeably lighter, cooler.
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 Talos Bronze on the colour wheel See Old Copper on the colour wheel
All matches: Talos Bronze equivalents · Old Copper equivalents