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ESA has a doc about the design of the docking ports (IDS - Internation Docking Standard, sometimes also called NDS NASA Docking System, sometimes called LIDS - Low Impact Docking System. Though technically LIDS became NDS which fulfills the IDS standard). On page 3 it says for the IDS ports, design goal is 30 cycles. For the CBM ports, a NASA Tech Doc ...

There are several kinds of hatches on the ISS to permit many different kinds of vessels and modules from different sources to connect to the station. CBM is one of those, and as you note is an asymmetric gendered connection system with active and passive nodes. The ISS is equipped with both active and passive CBM nodes. The full range of connectors available ...

So far it has always been the same CRS-1 CRS-2 CRS-3 CRS-4 CRS-5

There are a list of things that have to happen during an unberth operation. The two CBM ports (one on the vehicle, one on the station module) have hatches that have to be opened and closed. There is a small narrow vestibule in between the two hatches once the two are berthed. That is, the docking ring of each side mates, and once that is airtight, there ...

I can comment that there are two hatches. Each side has its own and they are independently opened.