ΔE 13.5, fair: the same colour family, but not a straight swap. Flat Flesh is a little darker, more muted than Orange Magma.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Flat Flesh is a little darker, more muted than Orange Magma.
The same difference applies the other way round: Orange Magma is a little lighter, more saturated.
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 Orange Magma on the colour wheel See Flat Flesh on the colour wheel
All matches: Orange Magma equivalents · Flat Flesh equivalents