I have three Roku’s and they all have a different amount of channels on them. Is there a way to sync them so that they all match?
If they are tied to the same Roku account, they should match. It should be noted that some older Roku's do not support some channels, so those will not be available on the old models.
And... if you're speaking of having the same order of channels on your Home Screen that is not possible. You have to arrange them on each individual device.