Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
If some of your devices are older, they might not support the latest channels. If not, they won't appear on those boxes.
But if you are referring to the the channel grid not matching between devices, the icon layout is independent between devices, and there's no way to force them to match up.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.