ΔE 15.5, loose: different enough that you should pick on purpose. Moonpetal is more muted, cooler than Vivid Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Moonpetal is more muted, cooler than Vivid Flesh.
The same difference applies the other way round: Vivid Flesh is 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 Vivid Flesh on the colour wheel See Moonpetal on the colour wheel
All matches: Vivid Flesh equivalents · Moonpetal equivalents