Dear Aspirant ,

As I understand your question

The only difference between MBA and PGP is that MBA is masters degree and therefore a student having MBA can apply for admission to Ph.D. in any university in India and can appear for NET of UGC. As against this PGP is Diploma and some of the institutions have obtained its equivalence to MBA whereas other institutions have not done this and therefore the students of such institutions are not eligible for Ph.D. and NET.

best of luck for your bright future .