Are you trying to order parts?
You should be able to tell what they are by the type of connector studs, and the shape of the fill cover.
Coke usually always use pin locks studs, and Pepsi and others use ball locks.
Also, look at some of the on-site repair parts pictures and you'll see the differences.
Keg #1: Brown Bomber Bourbon/Oak Vanilla Porter
Keg #2: Lawnmower APA just kicked :(
Keg #3 The Bollocks ESB
Bottled: Mjolnir Mead, Lazy Daze Hefe.