A one hour connection in MNL is asking for trouble. It is a very congested airport and the Gate delays are there. Not all the Gates are working all the time so even if your flight comes on time, your Gate might still be busy. Yes PR use the same terminal and there is currently an issue with Passenger Rights in The Philippines and they will obviously put you on THEIR next flight though TG (Thai) and 5J ( Cebu Pacific) fly from MNL to BKK and Air Asia fly from MNL to DMK. I am sure that at this moment in time PR is not going to put you on a different airline though the Philippines Government is working on a new act to get airlines to put on any available airline. If it is not a significant amount a better routing is always the option to choose. If you get a few hours in MNL then it would not be a problem.