ΔE 19.0, loose: different enough that you should pick on purpose. Bad Moon Yellow is a little darker, much more saturated, warmer than Pastel Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Bad Moon Yellow is a little darker, much more saturated, warmer than Pastel Yellow.
The same difference applies the other way round: Pastel Yellow is a little lighter, much more muted, 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 Bad Moon Yellow on the colour wheel
All matches: Pastel Yellow equivalents · Bad Moon Yellow equivalents