ΔE 16.0, loose: different enough that you should pick on purpose. Rotten Pus is a little darker, warmer than Bad Moon Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Rotten Pus is a little darker, warmer than Bad Moon Yellow.
The same difference applies the other way round: Bad Moon Yellow is a little 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 Bad Moon Yellow on the colour wheel See Rotten Pus on the colour wheel
All matches: Bad Moon Yellow equivalents · Rotten Pus equivalents