ΔE 34.7, loose: different enough that you should pick on purpose. Forged Red is noticeably darker, much more saturated, cooler than Fire Opal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Forged Red is noticeably darker, much more saturated, cooler than Fire Opal.
The same difference applies the other way round: Fire Opal is noticeably lighter, 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.
See Fire Opal on the colour wheel See Forged Red on the colour wheel
All matches: Fire Opal equivalents · Forged Red equivalents