Bastion Grey vs IJN Medium Grey

How close are they?

ΔE 14.0, fair: the same colour family, but not a straight swap. IJN Medium Grey is noticeably lighter, more muted than Bastion Grey.

Can I use IJN Medium Grey instead of Bastion Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). IJN Medium Grey is noticeably lighter, more muted than Bastion Grey.

Can I use Bastion Grey instead of IJN Medium Grey?

The same difference applies the other way round: Bastion Grey is noticeably 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.