Your 'true' scores can be found here at myfico. Automobile dealerships tend to use 'auto-enhanced' scores based on auto loans you've had before. Same with 'types' of scores...for the most part. Most lenders pull ficos for the most part. Any scores found at other websites tend to be FAKOs. Scores that that are intuitive, but can be off by more than 100 points!
You state 'pretty much the same'. Does that mean there are indeed differences? That would be part of it. They each have different scoring models they use as well, I believe. If not; someone will chime in soon, I'm sure. I believe they do, though. For instance; Equifax is harder on me than the others. (Shrug...)