ΔE 14.8, fair: the same colour family, but not a straight swap. Light Blue (Luftwaffe) is warmer than Fenrisian Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Light Blue (Luftwaffe) is warmer than Fenrisian Grey.
The same difference applies the other way round: Fenrisian Grey is 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 Fenrisian Grey on the colour wheel See Light Blue (Luftwaffe) on the colour wheel
All matches: Fenrisian Grey equivalents · Light Blue (Luftwaffe) equivalents