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As the title says. @JonasResende had a thread on Eduard, Count Palatine having a son and heir; and @Valena has done a TL where Rupert marries Frances Bard. But I haven't seen any on Maria of Nassau and her Pfalz-Simmern-Kaiserslautern hubby.
Maria married Ludwig Heinrich of Kaiserslautern in 1666 (after she had been offered to all three sons of Charles I apparently). He died 8 years later with no kids. I'm guessing -considering how her sisters sprogged - that the problem was on his end (I would say consanguinity might have also played a role, but considering he and the Great Elector would have had more or less the same ancestors, I don't know if this is a valid argument). Ludwig Heinrich (or his son) would've stood higher in the Pfalz succession than the Neuburg bunch. So the Palatinate would - theoretically - not change religion TTL. But how else would this affect things?