Some cable service providers may list different versions of the same model.  For example, Xfinity and Spectrum's compatible modem lists display different versions and revisions (rev) of the Surfboard modems (i.e. S33, SB8200, etc.)
To maintain a high-quality standard and ensure production continuity, ARRIS sometimes qualifies components from different sources, indicated by different hardware versions. Regardless of the hardware version, the products all meet the same technical specification, requirement, and customer expectation. There is no difference in performance between versions.