So i switched internet companies not too long ago, and my old modem was a Motorola SURFboard modem and my router WILL NOT work on my new comcast router, So can i use my Motorola SURFboard modem from my old internet company with Comcast and still get internet?

The modem is Motorola SURFboard Model: SB5101
On Comcast's site it has that modem under approved modems but i dont know if it will work because its from a different internet company.

http://mydeviceinfo.comcast.net/