I have also applied for PCC again today after the last one had to be withdrawn as my passport renewal was in process. BLS cannot process 2 applications at same time for your passport and they only remembered after I paid for it lol. I had given the old PCC for expired passport but since the new passport came just got delivered, I will have to do it again for the new one as requested by representative( Just to be on safe side/No one asked for it yet). I stayed in India for 3 months last year.
PCC is valid for 6 months to 1 year period but if your last PCC is kinda old then go for the new one. It takes 9-10 days anyway for most cases.