The knowledge base is similar but not identical. The training focus can be quite different. Business school PhD programs are about 95% for the purpose of training business school faculty. If you don't go teach in a business school, you're a failure to those programs. Industrial Organizational Behaviour programs in stark contrast are developed in the scientist-practitioner model, the idea that all IOs should have a foot in both research and practice. It ends up producing graduates with very different philosophical approaches to research.
The knowledge base is similar but not identical. The training focus can be quite different. Business school PhD programs are about 95% for the purpose of training business school faculty. If you don't go teach in a business school, you're a failure to those programs. Industrial Organizational Behaviour programs in stark contrast are developed in the scientist-practitioner model, the idea that all IOs should have a foot in both research and practice. It ends up producing graduates with very different philosophical approaches to research.