WI:Bohemian ruled Lesser Poland

What if Poland retains most of Silesia except for Cieszyn and Raciborz and Poland loses Krakow and Sandomierz: the Duchy of Raciborz, Cieszyn, Cracovia and Sandomir become parts of Bohemia instead of Silesia? - as the Province of Vislania once the Bohemian King gives up his claims to the Polish throne and most likely it will forward its claims to Hungary.

In OTL the largely Polish speaking parts of Silesia had Czech as their official language if Krakovia and Sandomierz had Czech as their official language, once the Polish language emerges and gains recognition Polish language becomes recognised and Bohemian Malopolska(including Cieszyn and Raciborz) will start to shed its Czechness and will want their variant of Polish as official language.

There will be two Polish languages the Posenian-Breslau variant and the Czechoslovakian influenced Cracovian variant, how will this affect the history of Poland?
 
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