ΔE 52.2, loose: different enough that you should pick on purpose. Misted Yellow is noticeably darker, much more muted, warmer than Pastel Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 52). Misted Yellow is noticeably darker, much more muted, warmer than Pastel Yellow.
The same difference applies the other way round: Pastel Yellow is noticeably lighter, much more saturated, 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 Misted Yellow on the colour wheel
All matches: Pastel Yellow equivalents · Misted Yellow equivalents