Not sure how that is a double barrel clone really.
No screen
Parallel instead of series
Way different battery door
No wheel
Plastic
Limited output control
With the exception of the shape, it's totally different. And if we are starting a whole "it's a clone since it is the same shape" thing then we are starting a whole new thing. *Example only* We would have to call the vicious ant spade a clone of a frankenskull (just an example, I'm sure there were other rectangle shaped squonks before the frankenskull) because they are actually more similar than this cheap digiflavor mod and a double barrel.
Edit-
I'm also pretty sure there was a mod shaped the same way as the double barrel that came out before the double barrel did, so if one would say the shape makes it a clone, the double barrel its self would have to be called a clone. (I am trying to remember the mods name, will update if I can think of it)
I just remember the name of it. The dicodes dani box.