Answers: 0
Accepted answer: no
Accepted answer: no
Related: How do I know what manufacturer's parts are on a gun?
The accepted answer to the linked question indicates that all guns by a particular manufacturer share a common trait: Tediore guns always explode when you reload them, Hyperion guns become more accurate the more you shoot, and so on.
Does this apply to E-tech weapons as well? For example, will a Railer Sniper Rifle made by Dahl shoot differently than a Railer Sniper Rifle made by Maliwan?