I think Steve ended up being a better salesperson than Jean-Louis Gassé. And to be fair, for all its incredible effort I don't think that BeOS was as mature as NextStep.
As I recall, there were some early UI efforts that essentially copied the Classic MacOS feel (the MacOS 8/Copland look) onto NextStep, but they were dropped in favor of OS X's Aqua design (which took inspiration from the iMac design)
As I recall, there were some early UI efforts that essentially copied the Classic MacOS feel (the MacOS 8/Copland look) onto NextStep, but they were dropped in favor of OS X's Aqua design (which took inspiration from the iMac design)