ΔE 24.6, loose: different enough that you should pick on purpose. Titanate Yellow is noticeably lighter, much more muted, cooler than Dorn Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 25). Titanate Yellow is noticeably lighter, much more muted, cooler than Dorn Yellow.
The same difference applies the other way round: Dorn Yellow is noticeably darker, much more saturated, warmer.
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 Titanate Yellow on the colour wheel
All matches: Dorn Yellow equivalents · Titanate Yellow equivalents