ΔE 15.8, loose: different enough that you should pick on purpose. Natural Flesh is a little darker, more muted, warmer than Slime Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Natural Flesh is a little darker, more muted, warmer than Slime Yellow.
The same difference applies the other way round: Slime 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 Slime Yellow on the colour wheel See Natural Flesh on the colour wheel
All matches: Slime Yellow equivalents · Natural Flesh equivalents