Dude, your "(Old) Prussian language" went
extinct in Prussia in the
early 18th century. From then on the Prussians spoke
German, only a few Polish.
And here is
Prussia in 1800, nine years after Mozart's death:
Almost
90 % of the Prussian territory was where
today Poland and Lithuania are located. Only about 10 % on the soil of today's Germany.
You are confusing Prussia of the 18th century with Prussia after 1815; from then on Prussia spread over to the Rhine river and beyond.
Now stop it before you embarrass yourself even more.
You can continue with your doubtful sources.
Instead of that you may see that
BERLIN was the capital city of Prussia (and then Germany) from 1701 to 1947 !!!!! Changed from Königsberg (today in Russia). "90% was Poland and Lithuania" but they chose Berlin for capital city !!!!!! Think, dude, think! Copy/paste from internet is not enough.
Here is something from Britannica, world-class source:
"Prussia, German Preussen, Polish Prusy, in European history, any of certain areas of eastern and central Europe, respectively the land of the Prussians on the southeastern coast of the Baltic Sea, which came under Polish and German rule in the Middle Ages, the kingdom ruled from 1701 by the German Hohenzollern dynasty, including Prussia and Brandenburg, with Berlin as its capital,
seized much of northern Germany and western Poland
in the 18th and 19th centuries and united Germany under its leadership in 1871."
"The Prussians spoke German" ??? A lot of fantasy. Now let's begin with the history again, not with your simple statements.
Frederick the Great (Friedrich der Große), King of Prussia in the 18th century,
hated the German language. Proven 100%. The official languages in Prussia were
Latin (first language), Polish and .... French. NO GERMAN, dear Mr./Ms Schweikart !!! And the same Friedrich loved Latin and French.
Somewhere around 1770 Frederick agreed that the Prussian laws will be translated also into "plattdüts" (the experts translate it as a plain, understandable German), one of the many existing "German" languages, spoken only in North Germany. But plattdüts has been used only for the laws, nothing else.
As I said already (based on the historians) the real germanisation (unification) of the language started in late 20s of the 20th century.
Somehow you ignored the BIG difference b/w the words "curpi" and "Schoh". Well, the whole languages had different words, not only some words.
Another task for you, more complex. What is the meaning of the word "reddan"?
And please check how many German-Prussian dictionaries (vocabularies) have been published in the 19th century. Why did they need dictionaries by the way ???