I was obviously wrong about the term Prussia. I did find this on Parnes.net on the history of Hungarian Jews:
“Internal Life during the 19th Century
In origin, spoken language, and cultural tradition and customs, Hungarian Jewry was divided into three sections: the Jews of the northwestern districts (Oberland) of Austrian and Moravian origin, who spoke German or a western dialect of Yiddish; the Jews of the northeastern districts (Unterland) mostly of Galician origin, who spoke an eastern dialect of Yiddish; and the Jews of central Hungary, the overwhelming majority of whom spoke Hungarian. In the classification of the inhabitants according to nationality, the overwhelming majority of the Jews in Hungary declared themselves members of the Hungarian nation;”
So basically the concept of Oberland existed, as Hungarian Jewry was somewhat of an amalgam of Jews from different origins. As I understand it the more assimilated lost their connection to either East or West, and the rest were classified as Polish or oberland. Then chassides was added to the mix…
You can contend that oberlander are really German Yekkes, similarly to the anti-Yiddish crowd (no offense, it’s just an illustration) that claims Yiddish is only a different dialect of German– it depends how far back you chose to go.