ΔE 14.6, fair: the same colour family, but not a straight swap. Lemon Yellow is noticeably darker than Primary Yellow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Lemon Yellow is noticeably darker than Primary Yellow.
The same difference applies the other way round: Primary Yellow is noticeably lighter.
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 Primary Yellow on the colour wheel See Lemon Yellow on the colour wheel
All matches: Primary Yellow equivalents · Lemon Yellow equivalents