Problem: The sun was covered by a thick cloud all morning, but luckily, by the time the picnic started, *it* was gone.
Are "it" and "The sun" the same?
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Answer: no

Problem: John couldn't see the stage with Billy in front of him because *he* is so tall.
Are "he" and "John" the same?
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Answer: no

Problem: Lionel is holding captive a scientist, Dr. Vardi , who has invented a device that turns animals invisible; Lionel plans to use it on Geoffrey and send *him* to steal nuclear material from an army vault.
Are "him" and "Lionel" the same?
****
Answer:
no