ΔE 10.9, fair: the same colour family, but not a straight swap. Deep Sky Blue is a little lighter, more muted than Amarth Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Deep Sky Blue is a little lighter, more muted than Amarth Blue.
The same difference applies the other way round: Amarth Blue is a little 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.
See Amarth Blue on the colour wheel See Deep Sky Blue on the colour wheel
All matches: Amarth Blue equivalents · Deep Sky Blue equivalents