I’m guessing it’s more dependent on the brands you’re buying, but there shouldn’t be that significant of a flavor change. Also most cans have a liner inside them to protect the contents from chemically affecting the contents. I just checked a few sources for various products, and all of them were simply the beans in a water solution.

Some did include salt, which may be having a minor effect. The French cut, julienne, provides a higher surface area / volume ratio. This means the beans will “marinate” in the solution more effectively than larger cut beans. As in, the salt and water have better access to the inner parts of the beam, leaving them more tender and “marinated.”

I’m using that weird very loosely because I honestly can’t remember the right word.