Why do all three credit scores differ from Transunion to Experian?

So, I went on to Transunion and pulled all three credit (Transunion, Experian and Equifax) and the did the same at Experian. On Experian the scores are 100 points lower. For example my Experian score on TU is 707 but on EX its 569. Shouldn’t their scores be the same no matter where you pull them from? Who do you believe?

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