ΔE 18.1, loose: different enough that you should pick on purpose. Natural Flesh is noticeably darker, warmer than Light Bismuth Yellow.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Natural Flesh is noticeably darker, warmer than Light Bismuth Yellow.
The same difference applies the other way round: Light Bismuth Yellow is noticeably lighter, 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 Light Bismuth Yellow on the colour wheel See Natural Flesh on the colour wheel
All matches: Light Bismuth Yellow equivalents · Natural Flesh equivalents