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Enormous.Other than barrel length…. How different can it be? I guess the choke can change it….. that said I'm not familiar with them at all.
Two different areas for me, field/sporting guns and defensive guns. As @esbshaw noted, when you are shooting games like Trap, Skeet and Sporting Clays, you need to know where your patterns are going with your particular loads. My trap gun is very different from my field gun.
For defensive shotguns we need to understand barrel / ammunition (buckshot) combinations are like snowflakes, no two are alike. You can have an 18" cylinder choke Remington 870 barrel shoot one load like crap and another barrel of the same configuration will shoot a tight group. Some ammo likes some chokes better. If you look at the fifth photo down in this article, you can see the difference in groups and points of impact from 00 buck even at close distances (the head shots). I have students bring the defensive ammo they are planning to use at home and in the class we pattern at typical home defense distances so they can see both pattern and point of impact. Good question you have.