Assuming both guns have original barrels mated to the receivers there should be no problem with ejecting 2 3/4" hulls. You might need to look elsewhere for the problem.
A friend o mine once brought an early Browning 16 gauge A5 for me to look at which he was considering buying. It was giving ejecting problems when he test-fired it. This gun had the push forward through the front of the trigger guard safety, BUT, had a 2 3/4" chambered barrel on it.
I looked at it & explained to him it was an early 2 9/16" gun which had been retrofit with a later 2 3/4" barrel without the ejection port having been modified. I then told him what would have to be done to make it work.
He decided since it was no longer original he would pass on it & try to find another more to his liking, which I felt was a smart move.
