Flag changed purchases, compare promotion pay. Every one is ready to run, and you can adjust it in plain language.
Send both print proof links to the coordinator and hold the task.
Your coordinator gets both revision links in chat when the task and current proof differ, with the task held for a human choice.
Warn reviewers when a print proof changes after approval arrives.
Keep reviewers aware of changes to a proof before they act on a decision. Your task shows the mismatch and asks for confirmation.