Coal Black vs Field Blue

How close are they?

ΔE 14.3, fair: the same colour family, but not a straight swap. Field Blue is more muted than Coal Black.

Can I use Field Blue instead of Coal Black?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Field Blue is more muted than Coal Black.

Can I use Coal Black instead of Field Blue?

The same difference applies the other way round: Coal Black is 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.