Mumbai Airport: Transferring within T2 on separate tickets

Hi all, I will be arriving on an international flight at T2 (4.55am) and would like to directly continue my trip on a separate ticket. The flight would be with Air India, which also leaves from T2. My question: Do I need to get out of the security area and then re-enter it or can I just stay inside the security area? I' trying to figure out how much time I need to leave between arrival and departure. My options with Air India are 7:05am or 11:30am Thank you in advance for sharing your experience. PS: I won't have checked luggage / travelling with carry on only