ΔE 9.6, close: similar, with a visible difference side by side. Fire Giant Orange is more muted, warmer than Orange. They are different kinds of paint: AMMO by Mig Orange is an opaque base/layer paint and Army Painter Fire Giant Orange 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 10). Fire Giant Orange is more muted, warmer than Orange. They are different kinds of paint.
The same difference applies the other way round: Orange is more saturated, cooler.
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 Orange on the colour wheel See Fire Giant Orange on the colour wheel
All matches: Orange equivalents · Fire Giant Orange equivalents