Hi, yes, I would say first one is past tense and second one is past perfect . Please let me share your comments on this.
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Debpriya DeIs there any difference in meaning between #1 and #2 ?Not much. To my ear #1 seems to show more doubt that John stole the books, and #2 seems to show a little more willingness to believe that John stole the books. Still, there really isn't much difference in meaning.