Here's the comparison between our Darak Kid's A & B_type bodies.

Visually, there aren't too many differences. The main differences are in their mobility.
While A_body has single jointed elbows, B_body has double jointed elbows allowing their arm to be bent further.
Also, A_body does not have a joint in the wrist but B_body has a joint.
B_body's wrist joint has a magnet which makes it possible for you change their hands.

You'll see our A_type body on the left and B_type body on the right.