ΔE 27.7, loose: different enough that you should pick on purpose. Iridescent Bright Gold (Fine) is noticeably lighter, more muted than Shin Gunto Gold. They are different kinds of paint: Army Painter Shin Gunto Gold is a metallic and Golden Iridescent Bright Gold (Fine) is a pearl paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Iridescent Bright Gold (Fine) is noticeably lighter, more muted than Shin Gunto Gold. They are different kinds of paint.
The same difference applies the other way round: Shin Gunto Gold is noticeably darker, 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 Shin Gunto Gold on the colour wheel See Iridescent Bright Gold (Fine) on the colour wheel
All matches: Shin Gunto Gold equivalents · Iridescent Bright Gold (Fine) equivalents