How was Hungary different from the Holy Roman Empire?

Hungary was founded by the Hungarians, a Finno-Ugric people who came to the plain between the Danube and the Carpathians at the turn of the 9th-10th centuries from the Kama. They quite late, by the standards of Europe, adopted Christianity and created their own kingdom. Hungary had good cavalry and in some periods of its history even took control of the Slavic lands (Slovakia and Croatia).

The Holy Roman Empire united many territories in the center of Europe, both Roman-speaking (northern Italy) and German-speaking (Germany, Switzerland) or Slavic (Bohemia, Slovenia).

Some of its cities were part of the Hansa, the king on the territory of the empire until the beginning of the 18th century was alone (in Vienna, then appeared in Prussia), and the emperor ruled over it.