Premiere & Roamio in Same Room

I currently have a Premiere and TiVoHD in my family room. The Premiere has the Comcast CableCard in it and the TiVoHD is OTA. I was able to setup the Premiere to be DVR 1 and the TiVoHD to be DVR 2 and use the switch on the old TiVo remote to switch back and forth between the two.

I'm thinking of ditching the TiVoHD for a 4-tuner Roamio and am wondering if I can have the same setup. If I continue using the old remote, can I continue to distinguish between the two? Can I set the Roamio to be DVR 2 and just continuing using the switch to flip between the two?

Thanks for anything you can share.