I am 100KWHY. According to the complete list of buried celebrities in Baidu Encyclopedia, Voltaire's body was lost on 1793, and the reason is unknown, which needs to be verified. Rousseau's urn with a heart entered the Pantheon in 18 1 1 year. There have been several changes before, and the reasons are unknown and need to be studied.
Then I can answer your question like this now: Voltaire's remains have disappeared, and part of Rousseau's remains are preserved in the Pantheon; In other words, even if you dig up their coffins in the Panthé on in Paris, you can't see their whole bodies.
PS:
Now, Voltaire and Rousseau are buried in the most central and prominent position of the whole tomb group in the underground palace, with tall and exquisite coffins. Before they died, they had different views and always quarreled. After their birth, they were both honored as spiritual pioneers of the Great Revolution and buried in one place.