You can always get an affidavit done. But to be honest, it is understood that Passport does have elaborated names and that is why other details like date of Birth, parent's name, address are also verified. And so it is not an issue if you want to upload your passport as your Id proof. But to be on a safer side, you can always get an affidavit done stating that both the names belong to you. It wont be necessary but during Counselling, you can show this affidavit.