Grey Teal vs Medium Grey Blue

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Medium Grey Blue is a little lighter, more saturated than Grey Teal.

Can I use Medium Grey Blue instead of Grey Teal?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Medium Grey Blue is a little lighter, more saturated than Grey Teal.

Can I use Grey Teal instead of Medium Grey Blue?

The same difference applies the other way round: Grey Teal is a little darker, 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.