ΔE 7.9, close: similar, with a visible difference side by side. Naples Yellow Deep is a little darker than Imperial Fist. They are different kinds of paint: Citadel Imperial Fist is a one-coat contrast-style paint and Golden Naples Yellow Deep is an opaque base/layer 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). Naples Yellow Deep is a little darker than Imperial Fist. They are different kinds of paint.
The same difference applies the other way round: Imperial Fist 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 Imperial Fist on the colour wheel See Naples Yellow Deep on the colour wheel
All matches: Imperial Fist equivalents · Naples Yellow Deep equivalents