I would wonder why then when I had the dealer install my BR pipes, that the pipes came with 31/76 jets to be installed? And it ran great. After I installed the 585 and S&S's dual runner, I could not adjust the carb to stop the popping on both accel and decel, I bumped up to 32/78 and it eliminated all the popping except for the occasional sneezing thru the carb at 50-55mph. According to their (S&S) website on carb setup, to eliminate the sneezing they suggested to bump the inter up, which I did and now I'm running 33/78 without any issues.
With the above stated, all carbs are different due to the tolerance of parts, and if the jets are held to a tolerance of +/-.0005 on the size hole you can have +/-.001 between jets of the same size, hence the air fuel mixture screw to be able to fine tune the carb to the motor.
Bottom line, no 2 are alike