ΔE 15.4, loose: different enough that you should pick on purpose. Flanker Light Blue is a little darker, much more saturated than N8 Neutral Gray.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Flanker Light Blue is a little darker, much more saturated than N8 Neutral Gray.
The same difference applies the other way round: N8 Neutral Gray is a little lighter, much more muted.
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 N8 Neutral Gray on the colour wheel See Flanker Light Blue on the colour wheel
All matches: N8 Neutral Gray equivalents · Flanker Light Blue equivalents