ΔE 16.4, loose: different enough that you should pick on purpose. Fire Opal is a little lighter, much more muted than Weapon Bronze.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Fire Opal is a little lighter, much more muted than Weapon Bronze.
The same difference applies the other way round: Weapon Bronze is a little darker, 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.
See Weapon Bronze on the colour wheel See Fire Opal on the colour wheel
All matches: Weapon Bronze equivalents · Fire Opal equivalents