ΔE 10.4, fair: the same colour family, but not a straight swap. AMT-7 Greyish Blue is a little darker, cooler than Runic Cobalt.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). AMT-7 Greyish Blue is a little darker, cooler than Runic Cobalt.
The same difference applies the other way round: Runic Cobalt is a little lighter, 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.
See Runic Cobalt on the colour wheel See AMT-7 Greyish Blue on the colour wheel
All matches: Runic Cobalt equivalents · AMT-7 Greyish Blue equivalents