Peters was interesting, in that while they used the same slogan from station to station, the actual image campaigns were often unique to the station (or at least not shared between all stations who used that slogan; Ed Peters told me the former, but I know that two stations could have the same music - at least part of the WPIX "11 Alive" music package originated at KCST, it showed up in a snippet in a long lost retrospective I watched on KNSD's website in the 00s).
In this case, I am pretty sure "X Belongs" is not actually the only Peters "Belongs" package. One of my phone conversations with Peters seemed to confirm my suspicion that KTNV 1981 was part of a "13 Belongs" image package from Peters. (The beginning of the intro seems to correspond with the syllables "Thi-ir-teen Be-longs".) This may be connected to a possible "13 Belongs" music package with a nearly identical motif, that KOVR used around the turn of the decade (though I do not know if they used it for news, I've just seen a movie intro with a "13 Belongs" logo paired with said music). Also, I have additional suspicions that WTVD 1979 is "11 Together", and that KTVX 1981 might be a separate "2 Together" package. In addition, I've wondered if WJBK 1980 could be an entirely different "2 Together" also from Peters. (KVIA 1985 could also be another "7 Together" package, but I'm not sure if Peters still held exclusive trademarks on those taglines by then.)
So this "2 Belongs" could be by Peters without actually being "X Belongs".