UWorld and Anking.

I have noticed that I am getting UWorld questions right specifically from the new Anking cards I am doing. It seems like specific Anking cards were made just based on the UWorld questions. Is the Anking deck too tailored towards UWorld? Is the content specifically emphasized on UWorld/Anking what is specifically tested on Step2/Shelf? Or, is it UWorld/Anking will focus on component #1 of a certain topic and the shelf/step2 will ask about component #2 of that topic?