ΔE 13.8, fair: the same colour family, but not a straight swap. Light Blue (Luftwaffe) is noticeably darker, more muted than Neptune Glow.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Blue (Luftwaffe) is noticeably darker, more muted than Neptune Glow.
The same difference applies the other way round: Neptune Glow is noticeably lighter, more saturated.
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 Neptune Glow on the colour wheel See Light Blue (Luftwaffe) on the colour wheel
All matches: Neptune Glow equivalents · Light Blue (Luftwaffe) equivalents