truecredit.com vs freecreditreport.com?

I have the exact same information on these two sites for my credit report, and i am having two different sets of numbers for credit scores. Like my experian is 625 w/ tc.com and with fcr. its 654.
I mean thats a big difference. and when i went to the bank to get a loan just last week it was 636. and they pulled my experian report.
Why such the big difference. Which is the one to rely on?

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