Gypsum White vs Light Green Grey

How close are they?

ΔE 11.6, fair: the same colour family, but not a straight swap. Light Green Grey is a little darker, more saturated than Gypsum White.

Can I use Light Green Grey instead of Gypsum White?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Light Green Grey is a little darker, more saturated than Gypsum White.

Can I use Gypsum White instead of Light Green Grey?

The same difference applies the other way round: Gypsum White is a little lighter, 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.