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Side by side, shooting the same model cans, the same ammo on similar carbines with different barrel lengths, there will be a slight difference in the 16" compared to the shorter one. I've tested this with 16" vs. 10.5" and it was very noticeable to all of the 23 people assembled. However, the difference is not earth shattering & in a practical sense, not really perceptible unless compared side by side.
I find the difference between more obvious from the shooters position. The port noise is what gets me when shooting a can on an SBR. Standing off a bit, I can't really tell the diff between supressors or varying barrel lengths.