Longbeard Grey vs Light Blue RLM76

How close are they?

ΔE 11.3, fair: the same colour family, but not a straight swap. Light Blue RLM76 is a little darker, more saturated than Longbeard Grey.

Can I use Light Blue RLM76 instead of Longbeard Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Light Blue RLM76 is a little darker, more saturated than Longbeard Grey.

Can I use Longbeard Grey instead of Light Blue RLM76?

The same difference applies the other way round: Longbeard Grey 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.