Sycorax Bronze vs Dark Bronze

How close are they?

ΔE 24.0, loose: different enough that you should pick on purpose. Dark Bronze is noticeably darker, much more muted than Sycorax Bronze.

Can I use Dark Bronze instead of Sycorax Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Dark Bronze is noticeably darker, much more muted than Sycorax Bronze.

Can I use Sycorax Bronze instead of Dark Bronze?

The same difference applies the other way round: Sycorax Bronze is noticeably lighter, much 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.