(b) A law school shall provide substantial opportunities to students for: ... (3) the development of a professional identity
David Thomson has just posted a paper on this subject entitled 'Teaching' Formation of Professional Identity. He explains "how Professionalism relates to behaviors, such as timeliness, thoroughness, respect towards opposing counsel and judges, and responding to clients in a timely fashion." On the other hand, "Professional identity relates to one’s own decisions about those behaviors (which sounds like overlap, but it is not), as well as a sense of duty as an officer of the court and responsibility as part of a system in our society that is engaged in upholding the rule of law." In my view, professional identity is metacognitive, while professionalism is how lawyers specifically apply professional identity.
https://lawprofessors.typepad.com/legal_skills/2012/11/professionalism-versus-professional-identity.html