ΔE 17.3, loose: different enough that you should pick on purpose. Lemon Yellow is a little lighter, cooler than Moonbeam Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Lemon Yellow is a little lighter, cooler than Moonbeam Yellow.
The same difference applies the other way round: Moonbeam Yellow is a little darker, 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 Moonbeam Yellow on the colour wheel See Lemon Yellow on the colour wheel
All matches: Moonbeam Yellow equivalents · Lemon Yellow equivalents