Just curious... the box part # and the stamp number on the part do not match exactly... is that correct?
That's typical. The part has the engineering part number but the box will have the service part number.
In this case, the 4th digit of Ford's part number is the "engineering design responsibility code " that the part falls under. E = engine. Service parts use a different letter in the 4th spot. Z in this case denotes "Ford Cust. service Division".