FPs are random, not tied to ppl with same name. It is also asked randomly for people where CSIS and IRCC has purged sensitive data, and need to re-run checksThey ask for what they need, if they need it. Fingerprints are used to differentiate between those who may have the same name as someone with the same, or similar, name.
PCC are generally asked for if you’ve spent a significant time abroad, and for the country in question. They don’t need a PCC from Canada as they have access to search all Canadian criminal records.