ΔE 18.7, loose: different enough that you should pick on purpose. Dorn Yellow is a little lighter, much more saturated than Light Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Dorn Yellow is a little lighter, much more saturated than Light Yellow.
The same difference applies the other way round: Light 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 Light Yellow on the colour wheel See Dorn Yellow on the colour wheel
All matches: Light Yellow equivalents · Dorn Yellow equivalents