I'm guessing here, Steven, but I'd not expect a difference (and it might be either way) that could be found without shooting _a lot_ of patterns, if then. And even if you finally found a difference, it might or not be functionally related to the ratio of choke-to-bore at all, but just be a characteristic of the particular two tubes you are testing.
The only real way to tell is to pattern it and count the pellets in the 30" circle at 40 yards, divide by the number in the load and compare to charts. I have a barrel marked "modified trap" which patterns improved modified. I also have another trap barrel marked "modified" which is loose modified. Be sure to use the load you will be shooting at targets. Changing shells can change choke a full degree. I use promo loads in my mod/full double for doves and get i.c. and mod patterns.