ΔE 13.3, fair: the same colour family, but not a straight swap. Medium Grey Blue is more saturated, warmer than Frost Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Medium Grey Blue is more saturated, warmer than Frost Blue.
The same difference applies the other way round: Frost Blue is more muted, cooler.
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 Frost Blue on the colour wheel See Medium Grey Blue on the colour wheel
All matches: Frost Blue equivalents · Medium Grey Blue equivalents