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Do you mean creditscorecard instead of creditscoreboard?
Discover creditscorecard gives you FICO 8 from Experian, Discover IT gives you FICO 8 from TransUnion. Credit Karma on the other hand doesn't provide FICO scores at all, it provides VantageScore 3.0 which is rarely used by lenders, reason why it's different from FICO scores you get from Discover. Ignore CK scores and pay attention to FICO 8 from Discover.