Remember the inheritance law bug on the Iberia stream, where it went through the female line?Well, in 1066 Poland is ruled by Boleslaw III, he has no children yet. He also has 1 brother (no kids) and 1 sister, who is married to the duke of Bohemia (they may already have 1 or 2 children).
Hungary in 1066 is ruled by Salomon, he is still a minor (14 or 15 I believe). Before him, his uncle, Bela I, was the ruler of Hungary he was married to Ryksa/Richenza Piast, the aunt of Boleslaw III of Poland.
So, there could be claims, though having them unite within 8 years is pretty remarkable.
We also don't know which inheritance law Hungary or Poland has, by default most realms will start with partition (gavelkind) but in a video about inheritance we were told that f.e. Bohemia will have seniority as their default one.
I mean, just saying...
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