ΔE 7.0, close: similar, with a visible difference side by side. Aged Hide is a little lighter than Red Primer. They are different kinds of paint: AMMO by Mig Red Primer is an opaque base/layer paint and Army Painter Aged Hide is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Aged Hide is a little lighter than Red Primer. They are different kinds of paint.
The same difference applies the other way round: Red Primer is a little darker.
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 Red Primer on the colour wheel See Aged Hide on the colour wheel
All matches: Red Primer equivalents · Aged Hide equivalents