From the listing, I couldn't tell if the left tube was improved cylinder, or improved modified. My experience has left me with the conclusion that most shooters don't shoot tightly choked guns very well. If the shooting you intend for the gun is early season woodcock and ruffed grouse, those chokes won't likely work out too well, since the bird will be long gone by the time you say "I must be patient" in your head after the flush. Everyone who is chanting the mantra of leaving tightly choked guns alone will be silent when the regulations mandate non-toxic shot, which will be here sooner than they think.
I would pattern the gun, for sure, to see what you have. I'm not a believer in spreaders, but, different loads throw different patterns. Don Zutz was able to change his gun chokes with his reloader, and you can find his loads in a few of his books. But, if the guy who bored the barrels was thinking about goose hunting, and you want to shoot 1 oz loads at woodcock on september 1st, opening the guns chokes up may be the only way out. Putting tubes in a double is considered blasphemy by many here, but, they didn't buy your gun, and don't invite you to go hunting with them, so make the choice on your own.
Good luck. Make the decision after careful study of what your needs are, and what the gun provides.
Best,
Ted
