Necron Compound vs Flat Aluminum

How close are they?

ΔE 11.3, fair: the same colour family, but not a straight swap. Flat Aluminum is noticeably lighter than Necron Compound.

Can I use Flat Aluminum instead of Necron Compound?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Flat Aluminum is noticeably lighter than Necron Compound.

Can I use Necron Compound instead of Flat Aluminum?

The same difference applies the other way round: Necron Compound is noticeably darker.

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.