ΔE 13.4, fair: the same colour family, but not a straight swap. Cold White is noticeably lighter than N8 Neutral Gray.
Can I use Cold White instead of N8 Neutral Gray?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Cold White is noticeably lighter than N8 Neutral Gray.
Can I use N8 Neutral Gray instead of Cold White?
The same difference applies the other way round: N8 Neutral Gray 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.