ΔE 15.4, loose: different enough that you should pick on purpose. Sun Yellow is a little darker, more muted, warmer than Peach.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Sun Yellow is a little darker, more muted, warmer than Peach.
The same difference applies the other way round: Peach 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 Peach on the colour wheel See Sun Yellow on the colour wheel
All matches: Peach equivalents · Sun Yellow equivalents