The Super Black Eagle 3 stock will fit the Cordoba however you do not need to get a new stock to covert yours into the same left handed stock as the SBE 3 Left Handed. The Benelli Quadra Fit system makes these adjustments fairly easy once you understand the system. The magic is inside the stock with the Drop Shim Plate, not as much so with the Cast and Drop shims that are located behind the the reciever.
Let me know if you may need reference material or a phone call, I could walk you right through it and have your Cordoba not only fit you in the cast but perhaps some drop adjustments are needed as well.
Finally you could also change the orientation of the safety to left handed as well, this sometimes requires a skillfull touch.
Please PM me if needed. I have done nearly 1000 of these Quadra Fit fitting on Benelli's and similar.