Argue with a mechanic about automotive parts, the box and part number may be the same but.... I assure you the parts are not. The OP ask for advice and I gave it, good luck with EBay, RockAuto, Parts Geek and Autozone. Just like most Snap on tools there IS a difference.
This is like saying if I buy a tool from Snap On's website, and I buy a tool off a Snap on truck, they make look the same but they are different. Which we know isn't true.
I can assure you the Ford parts I buy off Rock Auto are exactly the same as the Ford parts I buy from the dealer.