Majestic Fortress vs Grayish Blue FS35237

How close are they?

ΔE 11.1, fair: the same colour family, but not a straight swap. Grayish Blue FS35237 is more muted than Majestic Fortress.

Can I use Grayish Blue FS35237 instead of Majestic Fortress?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Grayish Blue FS35237 is more muted than Majestic Fortress.

Can I use Majestic Fortress instead of Grayish Blue FS35237?

The same difference applies the other way round: Majestic Fortress is 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.