It depends on the models of the Roku devices and the type of remote. If it's a "simple" remote with no microphone button or pairing button, it will work with any Roku player that's not a stick. Sticks plug directly into a TV without the need for an HDMI cable and only work with "voice" remotes. Voice remotes work with any Roku player or Roku TV manufactured within the last several years and most Roku devices ever manufactured, but must be paired to the Roku device and can only be paired to one device at at time. Roku TV remotes (that aren't voice remotes) only work with Roku TVs and are generally manufacturer specific, although may work with more than one manufacturer's TVs.
Post the model numbers of your Roku devices as displayed under Settings->System->About and what kind of remote you have if you need more help.
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