[Adrig]

A digital product designer is basically a UX designer with knowledge of product management. While UX rely only on the user experience and the constraints of the user environment, the P.D. have to incorporate (and understand) business requests, production workflow, ect.

[seanmcdirmid]

That really isn't different from what a UXD already does, and it definitely doesn't require any ID skills. You might want to cast your net for just plain old UXDs, rather than people who have been trained specifically in product design (if there is indeed a real specialty there, I doubt that's true).