ΔE 14.2, fair: the same colour family, but not a straight swap. Purple Quasar is much more saturated than Shining Silver.
Can I use Purple Quasar instead of Shining Silver?
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Purple Quasar is much more saturated than Shining Silver.
Can I use Shining Silver instead of Purple Quasar?
The same difference applies the other way round: Shining Silver is much more muted.
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.