In Revel, the Product ID will dictate the Punchh Menu Item ID.
The only caveat to this is if the product in Revel has an Alternate Lookup ID. If there is an Alternate Lookup ID, this will override any other ID from Revel.
To learn how to edit a product's Alternate Lookup ID in Revel, please see:
How can I edit a product's Alternate Lookup ID in Revel?