Costco vs Sams Club 6V Golf Cart Batteries

As I crabbed many times, when I return a battery with a bad cell or cells with smoky electrolyte and unfixable differences in gravity I don't want to sit there and argue if the battery is bad or not. I have good experience with COSTCO and several arguments with Wal-Mart personnel. So, to be fair, I believe that if a person should chat with the battery department personnel at Wal-Mart and find someone reasonable, besides a pimple faced 22-year old know-it-all then my bias would have to change. But then how about when someone is on the road. Frankly I am skeptical about Wal-Mart. Costco personnel are to me around 10,000 times as intelligent. Can a person exchange a Wal-Mart battery at a Sam's or verse-visa? Out of the two batteries, the heaviest wins, if they are built by the same company.