Why would Family Search change ID#s
I have researched and found a family of four that originated in England and at least two children came to Canada. The original first four digits match (confirming this as a family) but all of the ID#s have been changed. The original ID's start with "M" and the new ID's start with "K". How can I confirm that I am researching the same family? Would the ID be changed because the family came to Canada from England? The last name was very common in England and in Canada, making this a difficult search.