Urban Decay Shag is a warm lavender with a frost finish that is limited edition and retails for $19.00. In comparison, Anastasia A1 (Norvina Vol. 1) is a cool lavender with a frost finish that is limited edition and retails for $12.00.
Anastasia A1 (Norvina Vol. 1) is 85% similar — it is less shimmery, cooler.