ΔE 15.6, loose: different enough that you should pick on purpose. Golden Cream is much more muted than Phalanx Yellow.
Can I use Golden Cream instead of Phalanx Yellow?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Golden Cream is much more muted than Phalanx Yellow.
Can I use Phalanx Yellow instead of Golden Cream?
The same difference applies the other way round: Phalanx Yellow is much more saturated.
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.