ΔE 13.9, fair: the same colour family, but not a straight swap. A-28M Greyish Blue is noticeably darker, more muted than Amulet Aqua.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). A-28M Greyish Blue is noticeably darker, more muted than Amulet Aqua.
The same difference applies the other way round: Amulet Aqua is noticeably lighter, 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.
See Amulet Aqua on the colour wheel See A-28M Greyish Blue on the colour wheel
All matches: Amulet Aqua equivalents · A-28M Greyish Blue equivalents