ΔE 49.7, loose: different enough that you should pick on purpose. Ancient Copper is noticeably lighter, much more saturated, warmer than Orgoth Bronze.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 50). Ancient Copper is noticeably lighter, much more saturated, warmer than Orgoth Bronze.
The same difference applies the other way round: Orgoth Bronze is noticeably darker, much more muted, 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 Orgoth Bronze on the colour wheel See Ancient Copper on the colour wheel
All matches: Orgoth Bronze equivalents · Ancient Copper equivalents