Derealization vs Depersonalization?

What's the difference?

Depersonalization symptoms

Symptoms of depersonalization include:

Feelings that you're an outside observer of your thoughts, feelings, your body or parts of your body, perhaps as if you were floating in air above yourself
Feeling like a robot or that you're not in control of your speech or movements
The sense that your body, legs or arms appear distorted, enlarged or shrunken, or that your head is wrapped in cotton
Emotional or physical numbness of your senses or responses to the world around you
A sense that your memories lack emotion, and that they may or may not be your own memories
Derealization symptoms

Symptoms of derealization include:

Feelings of being alienated from or unfamiliar with your surroundings, perhaps like you're living in a movie
Feeling emotionally disconnected from people you care about, as if you were separated by a glass wall
Surroundings that appear distorted, blurry, colorless, two-dimensional or artificial, or a heightened awareness and clarity of your surroundings
Distortions in perception of time, such as recent events feeling like distant past
Distortions of distance and the size and shape of objects

The main difference is that the DP is about yourself and a sense of inner alienation, and that DR is a sense of alienation of the world around you, as far as I know. Both equally disturbing.