ΔE 10.7, fair: the same colour family, but not a straight swap. Bright Neutral Grey is a little lighter than Grey Seer.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Bright Neutral Grey is a little lighter than Grey Seer.
The same difference applies the other way round: Grey Seer is a little 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.
See Grey Seer on the colour wheel See Bright Neutral Grey on the colour wheel
All matches: Grey Seer equivalents · Bright Neutral Grey equivalents