Orgoth Bronze vs Arcane Gold

How close are they?

ΔE 32.7, loose: different enough that you should pick on purpose. Arcane Gold is noticeably lighter, much more saturated, warmer than Orgoth Bronze.

Can I use Arcane Gold instead of Orgoth Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 33). Arcane Gold is noticeably lighter, much more saturated, warmer than Orgoth Bronze.

Can I use Orgoth Bronze instead of Arcane Gold?

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.