MAC It's Snowing is a warm pink with a metallic finish that is limited edition and retails for $20.00. In comparison, Anastasia B4 (Norvina Vol. 4) is a warm brown with a metallic finish that is limited edition and retails for $12.00.
Anastasia B4 (Norvina Vol. 4) is 85% similar — it is more shimmery, cooler.