Core answer
Start here. This is the direct spoken answer to practice first.
Why this question matters
Real changes rarely deserve identical test depth. This question checks whether test effort follows risk rather than habit or raw line coverage.
I separate the change by impact. The UI label needs a focused component or visual check if layout matters. Authentication needs policy and endpoint integration tests for anonymous, allowed, and denied users. The migration needs compatibility, data-shape, and rollback or roll-forward checks against a realistic database. I would not give all three parts the same gate.