It might be an issue of the wired computer thinking it's on a public network instead of a home network. If the SSID is the same on the old router and the new one, the wireless devices don't know any different because they think they're just operating on a different WAP in the same ESSID.
Manually set all the computers to the "Home Network" profile and homegroups should work again. Homegroups are a sticky mess and I just tell people to use a NAS device and avoid the headache. Centralized networking is where it's at.--
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