2 x atv 3's, 2 x different internet radio lists

hi guys, i have 2 identical apple tv 3's; identical in hardware, software and configuration

using internet radio (NOT iTunes Radio), and each device has a slightly different internet radio station list - specifically there is a station that i can access on one atv but it doesn't show up on the other atv - i'd like to have the same internet radio station available on both devices

any idea on how to update the internet radio station list please?