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If you got the three from this site, you are in great shape. Congrats!
You will always have 3 FICO scores, not one. Some mortgage lenders look for a median score though. That is calculated by taking the middle score, or 794 in your example.
Besides the different formulas, inquiries will usually only show on one report, so that can cause differences as well. Some creditors may not report to all 3 bureaus (sometimes you have to request them to).
There are many reasons that your scores will never be the same, but if you never, ever pay late you should be fine.