ΔE 22.6, loose: different enough that you should pick on purpose. Yellow Submarine is noticeably darker, warmer than Pastel Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Yellow Submarine is noticeably darker, warmer than Pastel Yellow.
The same difference applies the other way round: Pastel Yellow is noticeably lighter, cooler.
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 Pastel Yellow on the colour wheel See Yellow Submarine on the colour wheel
All matches: Pastel Yellow equivalents · Yellow Submarine equivalents