My Bank of America credit card shows me a "FICO credit score powered by TransUnion". I also have an account with CreditSesame which shows me a "credit score powered by TransUnion" (No FICO is mentioned). The Credit Sesame score is consistently ~60 points higher than the score I see through BoA. Most months they move together (both go up/down) but sometimes they move in different directions.
Why are these not equal?