ΔE 12.7, fair: the same colour family, but not a straight swap. Light Blue Green is a little lighter, more saturated, cooler than Light Aircraft Gray BS381C/627.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Light Blue Green is a little lighter, more saturated, cooler than Light Aircraft Gray BS381C/627.
The same difference applies the other way round: Light Aircraft Gray BS381C/627 is a little darker, more muted, 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 Light Aircraft Gray BS381C/627 on the colour wheel See Light Blue Green on the colour wheel
All matches: Light Aircraft Gray BS381C/627 equivalents · Light Blue Green equivalents