My CreditKarma's Vantage score is always the same as Wal-Mart TU08 score, when it updates.
This must be coincidental because the VantageScore range is 501-990 and Walmart's TU08 range (a FICO score) is 300-850.
Don't even bother with Credit Karma. They aren't even close to being right. Their score is about a hundred points off from my FICO score and it hasn't changed in about a year, despite massive changes in my credit situation. They aren't even worth what you pay for it and it's free.
+1 to Tinuviel. My Kredit Carma score updated withing one day on iquiries for cli increases I requested last weekend. Their Scores trend almost exactly with my Fico scores purchased although, KC seems to change more rapidly when utilization changes.