ΔE 3.9, very close: most people won’t see a difference side by side. Nuclear Sunrise is a little darker than Orange. They are different kinds of paint: AMMO by Mig Orange is an opaque base/layer paint and Army Painter Nuclear Sunrise is a one-coat contrast-style 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 4). Nuclear Sunrise is a little darker than Orange. They are different kinds of paint.
The same difference applies the other way round: Orange is a little 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 Orange on the colour wheel See Nuclear Sunrise on the colour wheel
All matches: Orange equivalents · Nuclear Sunrise equivalents