ΔE 12.8, fair: the same colour family, but not a straight swap. Gray FS36118 is more muted, warmer than Deep Azure.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Gray FS36118 is more muted, warmer than Deep Azure.
The same difference applies the other way round: Deep Azure is more saturated, 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 Deep Azure on the colour wheel See Gray FS36118 on the colour wheel
All matches: Deep Azure equivalents · Gray FS36118 equivalents