ΔE 14.8, fair: the same colour family, but not a straight swap. Sun Yellow is a little lighter, much more saturated than Dorn Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Sun Yellow is a little lighter, much more saturated than Dorn Yellow.
The same difference applies the other way round: Dorn Yellow is a little darker, much more muted.
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 Dorn Yellow on the colour wheel See Sun Yellow on the colour wheel
All matches: Dorn Yellow equivalents · Sun Yellow equivalents