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Difference between backtest engine and paper trading engine?

Is there any difference between the backtesting engine and the Quantopian paper trading engine? Let's say a sketchy strategy based on low cap stocks works really well in backtests. Is there a difference between paper trading for two months versus waiting two months and then run the backtest over the last two months?

In short: does paper trading on the Quantopian platform give more information than backtesting on out of sample data?