ΔE 12.9, fair: the same colour family, but not a straight swap. Dead White is a little lighter, more muted than Underbelly Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dead White is a little lighter, more muted than Underbelly Blue.
The same difference applies the other way round: Underbelly Blue is a little darker, 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.
See Underbelly Blue on the colour wheel See Dead White on the colour wheel
All matches: Underbelly Blue equivalents · Dead White equivalents