AIUI, without looking, the final section of the published Silmarillion, from Earendil's arrival in Valinor on, was copied directly from the portion at the end of the Qenta which Tolkien (for reasons unknown) revised ca 1937. However, CT reworked this material fairly heavily, in part because certain clearly obsolete concepts like the Children of the Valar were still present, but also because things were stated explicitly which he wasn't sure hadn't been modified by the LR or later thinking-- such as the "one drop rule" for Men.
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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