MX Keys works via Bluetooth or with the "Logi Bolt" USB plug. The answer given by "Anonymus" below is not quite correct: "for Business" comes with a Logi Bolt USB plug, this product does not.

The difference is exactly as some have already written. It does not need a Logi Bolt. Otherwise, from my point of view, almost exactly the same as the predecessor. I wouldn't have had to buy this one in the first place.

The only difference I think is that MX Keys for Business comes with a different receiver - the Logi Bolt.