Sydney Grace Brilliant Realm is a warm plum with a semi-matte finish that is permanent in palette and retails for $5.25. In comparison, Pat McGrath Xtreme Aubergine #2 is a neutral plum with a matte finish that is limited edition and retails for $25.00.
Pat McGrath Xtreme Aubergine #2 is 90% similar — it is darker, cooler.