Putting numbers to it,    The BA-330 (old) was 13.7m long vs. the new B330's 17.3m.   The difference is a docking attachment which looks suspiciously like the Axiom Space extension node proposed to attach ISS to new habitat modules and for spacecraft to dock to. Previously the BA-330's node was sent up on a separate launch and they were assembled on-orbit.   This extension is shown on recent Bigelow graphics.       Axiom Space node
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