You already have your answer that yes, they are the same. Thought I would let you know some history. Maybe 3 years or more ago, we had quite a debate over what a bully stick really was. Many refused to believe they had been letting their precious pups chew on THAT! LOL! It was sort of funny, but it really took quite a while before everyone pretty much came around to understanding what the bully stick, bull tendons, bull pizzle was all about. I think there may still be a couple of hold outs that think their bully sticks are made of some other tendon.
Mine have all loved them. They are also a great chew for new puppies. All of mine have teethed on them.