Underbelly Blue vs Glacier Blue

How close are they?

ΔE 10.5, fair: the same colour family, but not a straight swap. Glacier Blue is a little lighter than Underbelly Blue.

Can I use Glacier Blue instead of Underbelly Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Glacier Blue is a little lighter than Underbelly Blue.

Can I use Underbelly Blue instead of Glacier Blue?

The same difference applies the other way round: Underbelly Blue is a little 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.