Medium Sea Gray 2 (RAF) vs Flanker Blue

How close are they?

ΔE 7.8, close: similar, with a visible difference side by side. Flanker Blue is a little darker, more saturated, cooler than Medium Sea Gray 2 (RAF).

Can I use Flanker Blue instead of Medium Sea Gray 2 (RAF)?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Flanker Blue is a little darker, more saturated, cooler than Medium Sea Gray 2 (RAF).

Can I use Medium Sea Gray 2 (RAF) instead of Flanker Blue?

The same difference applies the other way round: Medium Sea Gray 2 (RAF) is a little lighter, more muted, warmer.

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.