My CK scores are about 50 points lower then my FICO scores. But I used them weekly for the changes in my report. They do have good info but their FAKOS are way off.
I have scores in the 700's for Fico's and CK is about 30-40 points lower. And it swings for almost no reason at times. I only use it to compare the reportrd info on my reoorts.
The only common use for them is to track your score to see whether you're improving or not in general. But I've noticed that things like getting a new card can make VantageScores drop like a rock. I paid an account to zero one time and my score dropped 50 points. Meanwhile FICO moved in a predictable pattern. Also I've noticed that my VantageScore varies widely between bureaus as opposed to FICO scores, which are always different but not as widely different as VantageScores.
The only reason the scores are no good is because virtually no lenders use them.
If the majority of lenders used CK scores, we'd all be sharing and exchanging information at myVantage.
There isn't any real correlation between the two models, not reliable anyway, because they weigh things differently, and there are notable differences in the way Vantage treats items like closed accounts, paid collections, and probably many other things I'm not even aware of.
Just ignore the CK scores. Use the reports there, but don't do anything based on your Vantage scores.