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