ΔE 14.9, fair: the same colour family, but not a straight swap. Phalanx Yellow is a little lighter, cooler than Moonbeam Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Phalanx 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 Phalanx Yellow on the colour wheel
All matches: Moonbeam Yellow equivalents · Phalanx Yellow equivalents