Dark Bronze vs Forged Red

How close are they?

ΔE 39.5, loose: different enough that you should pick on purpose. Forged Red is noticeably lighter, much more saturated, cooler than Dark Bronze.

Can I use Forged Red instead of Dark Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 39). Forged Red is noticeably lighter, much more saturated, cooler than Dark Bronze.

Can I use Dark Bronze instead of Forged Red?

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

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.