Both are DAO designs. The DAK features a design that reduces the weight of the trigger pull from a conventional DAO.
I dry fired a DAO P239 and a DAK P226 at the NRA show in Houston. The DAK had a noticeably lighter trigger pull.
The DAK feels like a DA revolver. You feel the same resistance throughout the trigger pull. It is not like a Glock, a Walther P99QA, the HK LEM trigger, or a ParaOrdnance LDA.