ΔE 13.6, fair: the same colour family, but not a straight swap. Peach Flesh is a little lighter, more muted than Brethil Blush.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Peach Flesh is a little lighter, more muted than Brethil Blush.
The same difference applies the other way round: Brethil Blush is a little darker, 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 Brethil Blush on the colour wheel See Peach Flesh on the colour wheel
All matches: Brethil Blush equivalents · Peach Flesh equivalents