No, you will unlock A and B content with any PIN from A or B.
Sure, this is not so good if you have more kids with big age difference and you have special folders for every kid with different PIN (not to mention if you also have your special folder with another PIN), but currently, I don't have any easy and intuitive approach how to do that.
Well, I would say that this is better than what we have at the moment, but such a change needs to be carefully discussed by the team, and fully documents so that someone's kids accidentally don't get access to your (not mine - don't have one!) special folder.
I am happy to test and confirm that this works as expected.
What is stopping this only unlocking content for a share with the specific PIN, and being able to enter another PIN? Is it a lot more complex?
Mark