Why do the three major credit bureaus give such different FICO scores?

In efforts to prepare myself for purchasing a home in the next year or two, I bit the bullet and ordered FICO scores & credit reports from the three major agencies. I was surprised by how much the FICO number varies, my highest score was 680 and lowest 655…that seems like a pretty drastic difference to me. Any idea why this is? Don’t they all use the same formula?

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