is GNDU is under PTU or both r diff ???
Both are different.
Guru Nanak Dev University Regional Campus Jalandhar and Guru Nanak Dev University, Amritsar are Affiliated To : Guru Nanak Dev University, Amritsar
IK Gujral Punjab Technical University is Affiliated To : IK Gujral Punjab Technical University, Jalandhar
You can also check the difference from the given below link
Guru Nanak Dev University Regional Campus Jalandhar, Details
Guru Nanak Dev University, Amritsar Details
IK Gujral Punjab Technical University, Jalandhar Details
Good Luck!!