Considering Elizabeth's initial impression of Lady catherine de Bourgh, what similarities exist between her and Mr. Darcy?

Ladt Catherine is similar to Darcy in a few ways, namely, her arrogance and condescending manner. 

"Lady Catherine was a tall, large woman, with strongly-marked features, which might once have been handsome. Her air was not conciliating, nor was her manner of receiving them such as  to make her visitors forget their inferior rank.”