ΔE 7.6, close: similar, with a visible difference side by side. Bad Moon Yellow is a little darker, more muted than Ammo Yellow. They are different kinds of paint: AMMO by Mig Ammo Yellow is an opaque base/layer paint and Citadel Bad Moon Yellow 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 8). Bad Moon Yellow is a little darker, more muted than Ammo Yellow. They are different kinds of paint.
The same difference applies the other way round: Ammo Yellow is a little lighter, more saturated.
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 Ammo Yellow on the colour wheel See Bad Moon Yellow on the colour wheel
All matches: Ammo Yellow equivalents · Bad Moon Yellow equivalents