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Hi there!

According to the headers of /camera/depth/image:

$ rostopic echo -n 1 /camera/depth/image | head
header: 
  seq: 304
  stamp: 
    secs: 1406254046
    nsecs: 731604330
  frame_id: /camera_depth_optical_frame
height: 480
width: 640
encoding: 32FC1
is_bigendian: 0

and the headers of /camera/depth_registered/image_raw:

$ rostopic echo -n 1 /camera/depth_registered/image_raw | head
header: 
  seq: 0
  stamp: 
    secs: 1406254097
    nsecs: 573718779
  frame_id: /camera_depth_optical_frame
height: 480
width: 640
encoding: 32FC1
is_bigendian: 0

They both are the same size: width, height and encoding are the same.