DHD's have the PTO take off on them too, so the internals are not the same do to the added PTO gear and the larger shaft.
the DLD usually breaks the output shaft where it comes out of the last bearing to support it. mine was broken cleaner than you could cut it with a bandsaw and resulted in no other carnage, but be careful, if you break one sled pulling with 500+ hp and it sends the full power to the front wheels instantly you could be in for a bunch more carnage.