PR means you're a permanent resident - you get one after living here for 7 years.
A Residence card just means you live and/or work here - an ID card, similar to the
PR card, but without the words 'Permanent' on the top.
If you're not a resident, you're not allowed into HKG.
If you are a resident, you get tested, tagged and bagged and spend 14 days in your flat or hotel electronically monitored.