NARS Tropical Express #4 is a cool purple with a matte finish that is permanent in palette and retails for $19.00. In comparison, Natasha Denona Nina's Orchid (82V) is a warm lavender with a satin finish that is permanent in palette and retails for $29.00.
Natasha Denona Nina's Orchid (82V) is 80% similar — it is darker, warmer.