ΔE 13.5, fair: the same colour family, but not a straight swap. Skorne Red is noticeably darker than Poppy Red. They are different kinds of paint: Army Painter Poppy Red is a one-coat contrast-style paint and Formula P3 Skorne Red is an opaque base/layer 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 13). Skorne Red is noticeably darker than Poppy Red. They are different kinds of paint.
The same difference applies the other way round: Poppy Red is noticeably lighter.
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 Poppy Red on the colour wheel See Skorne Red on the colour wheel
All matches: Poppy Red equivalents · Skorne Red equivalents