ΔE 5.8, very close: most people won’t see a difference side by side. Pyrrole Red is more saturated than Mars Red. They are different kinds of paint: Army Painter Mars Red is an opaque base/layer paint and Golden Pyrrole Red is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Yes, for most jobs. Very close match (ΔE 6). Pyrrole Red is more saturated than Mars Red. They are different kinds of paint.
The same difference applies the other way round: Mars Red is 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.
See Mars Red on the colour wheel See Pyrrole Red on the colour wheel
All matches: Mars Red equivalents · Pyrrole Red equivalents