Hoard Bronze vs Sulfur Ore

How close are they?

ΔE 27.8, loose: different enough that you should pick on purpose. Sulfur Ore is noticeably lighter, more saturated than Hoard Bronze.

Can I use Sulfur Ore instead of Hoard Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Sulfur Ore is noticeably lighter, more saturated than Hoard Bronze.

Can I use Hoard Bronze instead of Sulfur Ore?

The same difference applies the other way round: Hoard Bronze is noticeably darker, more muted.

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.