In Numbers.app, how can I trigger a response if newly input cell text matches text found anywhere in other sheets?

In Numbers.app on iOS, is it possible to trigger a response if sheet contains differing data to other sheets in same file? If not able to formulate on iOS, then on a Mac? And will the trigger still show up when viewing same file on iOS? - Sheet 1 = contact list from phone A - Sheet 2 = contact list from phone B - Sheet 3 = message list from phone C - Sheet 4 = contact list from phone

contact name for phone 123-456-7890

- Sheet 1 = *contact doesn’t exist* - Sheet 2 = Jane Doe - Sheet 3 = Jane Doe - Sheet 4 = Ashley How can I set a trigger that will alert me to Sheet 4’s cell “Ashley”? Each sheet contains different - number of rows - column headers