ΔE 14.3, fair: the same colour family, but not a straight swap. Bright Gold is noticeably lighter than Shin Gunto Gold.
Can I use Bright Gold instead of Shin Gunto Gold?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Bright Gold is noticeably lighter than Shin Gunto Gold.
Can I use Shin Gunto Gold instead of Bright Gold?
The same difference applies the other way round: Shin Gunto Gold is noticeably darker.
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.