ΔE 12.1, fair: the same colour family, but not a straight swap. Bright Neutral Grey is noticeably lighter than Shark White.
Can I use Bright Neutral Grey instead of Shark White?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Bright Neutral Grey is noticeably lighter than Shark White.
Can I use Shark White instead of Bright Neutral Grey?
The same difference applies the other way round: Shark White is noticeably darker.
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.