They are very similar and use the same chipset. There are a few differences, but either one should work fine.

Links:

https://www.techieinsider.com/arris-...torola-mb8600/

https://approvedmodems.org/arris-sb8...torola-mb8600/

https://techprojournal.com/arris-sb8...torola-mb8600/

https://www.mbreviews.com/arris-sb82...torola-mb8600/

https://www.reddit.com/r/HomeNetwork...do_you_prefer/