Terror Blue-Grey vs Grey Green

How close are they?

ΔE 11.4, fair: the same colour family, but not a straight swap. Grey Green is a little darker, more muted than Terror Blue-Grey.

Can I use Grey Green instead of Terror Blue-Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Grey Green is a little darker, more muted than Terror Blue-Grey.

Can I use Terror Blue-Grey instead of Grey Green?

The same difference applies the other way round: Terror Blue-Grey is a little lighter, more saturated.

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.