ΔE 12.5, fair: the same colour family, but not a straight swap. Mirage Blue is a little lighter, more muted, cooler than Ensign Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Mirage Blue is a little lighter, more muted, cooler than Ensign Blue.
The same difference applies the other way round: Ensign Blue is a little darker, more saturated, warmer.
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 Ensign Blue on the colour wheel See Mirage Blue on the colour wheel
All matches: Ensign Blue equivalents · Mirage Blue equivalents