ΔE 17.9, loose: different enough that you should pick on purpose. C.P. Cadmium Yellow Light is a little lighter, more muted, cooler than Sunpetal.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). C.P. Cadmium Yellow Light is a little lighter, more muted, cooler than Sunpetal.
The same difference applies the other way round: Sunpetal is a little darker, more saturated, 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 Sunpetal on the colour wheel See C.P. Cadmium Yellow Light on the colour wheel
All matches: Sunpetal equivalents · C.P. Cadmium Yellow Light equivalents