Do credit card lenders use the same credit bureau for preapproval and the hard inquiry?

My Experian credit report has 4 inquiries. TransUnion and Equifax both have 1.

I'm looking specifically into Discover. I saw that in my state Discover has pretty much a 50-50 chance of pulling Experian and Equifax. Discover's preapproval pulls Experian.

Do lenders usually pull a different bureau for preapproval and approval? Or is it usually the same?

by u/FunctionAlone9580
in r/CreditCards