ΔE 20.8, loose: different enough that you should pick on purpose. Imperial Yellow is a little darker, more muted, warmer than Zealot Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Imperial Yellow is a little darker, more muted, warmer than Zealot Yellow.
The same difference applies the other way round: Zealot Yellow is a little lighter, more saturated, 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 Zealot Yellow on the colour wheel See Imperial Yellow on the colour wheel
All matches: Zealot Yellow equivalents · Imperial Yellow equivalents