ΔE 10.0, fair: the same colour family, but not a straight swap. Golden Brown is a little darker, more muted than Fiendish Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Golden Brown is a little darker, more muted than Fiendish Yellow.
The same difference applies the other way round: Fiendish Yellow is a little lighter, 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 Fiendish Yellow on the colour wheel See Golden Brown on the colour wheel
All matches: Fiendish Yellow equivalents · Golden Brown equivalents