Graphene Gray vs Seaplane Gray

How close are they?

ΔE 6.8, close: similar, with a visible difference side by side. Seaplane Gray is a little lighter, more muted than Graphene Gray.

Can I use Seaplane Gray instead of Graphene Gray?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Seaplane Gray is a little lighter, more muted than Graphene Gray.

Can I use Graphene Gray instead of Seaplane Gray?

The same difference applies the other way round: Graphene Gray is a little darker, 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.