Yes the scores on Creditkarma are just as accurate as they are on other credit reporting websites.
CredkitKarma gets your credit scores from the same places that other credit score checking websites do so they are the same accuracy as other credit checking websites are.
I've checked CreditKarma and other websites and all the websites had the same credit scores for me.
I love CreditKarma though much better than I do other websites for checking my credit scores because I find that there website is much easier to use and navigate than other websites are.
Still I like to check my credit scores on several different websites to be sure they are all the same and to be alerted to any possible errors with my credit scores.