I believe the difference turn that Hustler SDX, comes with the Kawasaki engine again, and it has a newly designed deck opening, to distribute the grass clippings better. The Raptor SD also features an industry-leading Kawasaki engine zero provides unmatched power versus the competition.
Hustler Raptor 36 Zero Turn Mower Kohler - Henderson Equipment
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I am amazed at how well the bagger works in spite of zero fact that it is not powered. Thanks Hustler for being able to provide such a good quality machine for people like me Hustler can't spend turn lot of money!