ΔE 26.9, loose: different enough that you should pick on purpose. Fire Opal is a little darker, more muted, warmer than Shin Gunto Gold.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Fire Opal is a little darker, more muted, warmer than Shin Gunto Gold.
The same difference applies the other way round: Shin Gunto Gold is a little lighter, more saturated, cooler.
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 Shin Gunto Gold on the colour wheel See Fire Opal on the colour wheel
All matches: Shin Gunto Gold equivalents · Fire Opal equivalents