WI the PLC splits into 2 countries.

WI the Polish Lithuanian commonwealth split up into Kingdom of Poland and the grand duchy of Lithuania during/after the deluge. If this happens which of the 2 will come out best, how would the future look for them and how would this effect the rest of Europe.
 
Does that not more or less doom them to being swallowed up individually by either Russia, Prussia, Sweden, Austria, or most likely some combination of the above?
 
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