Bronze vs Gehenna's Gold

How close are they?

ΔE 18.8, loose: different enough that you should pick on purpose. Gehenna's Gold is a little darker, much more saturated than Bronze.

Can I use Gehenna's Gold instead of Bronze?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Gehenna's Gold is a little darker, much more saturated than Bronze.

Can I use Bronze instead of Gehenna's Gold?

The same difference applies the other way round: Bronze is a little lighter, much 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.