[mothered]

Hey, which has a greater chance of success in your opinion? And, can I buy the "wrong" item from a different site or does it have to be from amazon?

They're both equal.

Purchasing the Item from Amazon, will demonstrate that It's their Item, therefore they'll assume that they've sent that Instead of the one you've ordered.

Does amazon have a way to scan things and tell that they sell it ? Do they put like their own barcode sticker on a product?

Every company that operates on a scanning system, have dedicated barcodes specific to their Inventory.