Orange Magma vs Peach Flesh

How close are they?

ΔE 15.4, loose: different enough that you should pick on purpose. Peach Flesh is a little darker, much more saturated than Orange Magma.

Can I use Peach Flesh instead of Orange Magma?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Peach Flesh is a little darker, much more saturated than Orange Magma.

Can I use Orange Magma instead of Peach Flesh?

The same difference applies the other way round: Orange Magma is a little lighter, much more muted.

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.