As an individual consultant, it's not terribly uncommon for the contracting company to interview you and get a feel for how working with you will be beforehand. At least that's been my experience.
I work as an independent contractor developer (not as a consultant). I would say that I get pitched on projects and to respond, I relate my background and experience to the problems conversationally, but I wouldn't call it an "interview" or at least it's a radically different style of interview than a dev candidate, for example, I typically do not get asked tech screen questions like algorithms problems, whiteboard coding, etc. Perhaps my experience is different than the norm because I work with a small number of clients very closely. OTOH, maybe it's just a matter of perspective.