Dark Neutral Grey vs Luftwaffe Uniform

How close are they?

ΔE 9.5, close: similar, with a visible difference side by side. Luftwaffe Uniform is more saturated than Dark Neutral Grey.

Can I use Luftwaffe Uniform instead of Dark Neutral Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Luftwaffe Uniform is more saturated than Dark Neutral Grey.

Can I use Dark Neutral Grey instead of Luftwaffe Uniform?

The same difference applies the other way round: Dark Neutral Grey is more muted.

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.