If you're watching a live broadcast you should both get the same thing, pretty well in sync, although they could be a few seconds off.
If watching some on-demand content, you'd have to coordinate and start them at the same time.
- Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
- Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T
- TCL Roku TV 43S425/C107X, Ser X000001R60KV, wifi