You should be able to move them to the other house without much problem. You'll have to go through the network setup on each device to get it connected and then go through it again when you return them to the original house. It will remember the Wi-Fi passwords, so you don't have to keep entering them when you go back and forth.
Some people have reported issues with "local channels" on Roku channels/apps that provide cable TV-like channels when they move from one area to another.
When I visit family I take one with me and connect it to their network without any issues. It's all a matter of how much hassle you can put up with and it's really not much.
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