ΔE 14.1, fair: the same colour family, but not a straight swap. Red Glaze is a little darker, cooler than Peachy Flesh. They are different kinds of paint: Army Painter Peachy Flesh is a one-coat contrast-style paint and Two Thin Coats Red Glaze is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Red Glaze is a little darker, cooler than Peachy Flesh. They are different kinds of paint.
The same difference applies the other way round: Peachy Flesh is a little lighter, 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 Peachy Flesh on the colour wheel See Red Glaze on the colour wheel
All matches: Peachy Flesh equivalents · Red Glaze equivalents