Is the National N diploma same as a national from university?

The National N Diploma is not the same as a National Diploma from a University.

A National N Diploma (NND) is a vocational qualification offered by the South African Department of Higher Education and Training. It is a two-year qualification that prepares students for employment in a variety of fields.

A National Diploma (ND) is a three-year qualification offered by universities. It is a more advanced qualification than an NND and provides students with a deeper understanding of a particular field.