True Brass vs Orgoth Bronze

How close are they?

ΔE 17.9, loose: different enough that you should pick on purpose. Orgoth Bronze is noticeably darker, more muted than True Brass.

Can I use Orgoth Bronze instead of True Brass?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Orgoth Bronze is noticeably darker, more muted than True Brass.

Can I use True Brass instead of Orgoth Bronze?

The same difference applies the other way round: True Brass is noticeably lighter, more saturated.

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.