Not if they share one wire report, announcement, or other origin. Assess independence for each claim.
No. Syndication or common source material may explain it. Describe the supported dependency without unsupported accusations.
Yes. Separate the shared core from added interviews or document checks and assess their support individually.
Not necessarily. They can preserve missing text and show editorial differences, but should not inflate corroboration counts.
Record the earliest version found and label unresolved source relationships. Do not claim it is definitively the first report.