ΔE 8.4, close: similar, with a visible difference side by side. Flanker Light Blue is a little lighter, more muted, warmer than Phantom Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Flanker Light Blue is a little lighter, more muted, warmer than Phantom Blue.
The same difference applies the other way round: Phantom Blue is a little darker, 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 Phantom Blue on the colour wheel See Flanker Light Blue on the colour wheel
All matches: Phantom Blue equivalents · Flanker Light Blue equivalents