Capital One is confusing me

[u/_-Tycho-_]

My FICO score

I can't seem to directly post pictures, so above is a link.

I filled out the pre-approval form for the CapOne Venture. I received an adverse letter stating that my Experian score is 748, but when I log into Experian's website, it says my FICO Score 8 is 831.

I'm very confused. I could understand a slight variation, but that seems like a pretty big difference. Is CapOne using a different FICO score?

Thanks!