Arcane Blue vs Rus. AF Grey Prot. Coat

How close are they?

ΔE 13.9, fair: the same colour family, but not a straight swap. Rus. AF Grey Prot. Coat is much more muted than Arcane Blue.

Can I use Rus. AF Grey Prot. Coat instead of Arcane Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Rus. AF Grey Prot. Coat is much more muted than Arcane Blue.

Can I use Arcane Blue instead of Rus. AF Grey Prot. Coat?

The same difference applies the other way round: Arcane Blue is much 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.