Would a fender neck fit les paul?

A Fender neck will not fit on a Les Paul without modifications. The neck pocket of a Les Paul is designed for a Gibson-style neck, which has a different heel shape and dimensions than a Fender-style neck. To fit a Fender neck to a Les Paul, the neck pocket would need to be routed out to accommodate the different neck shape, and the neck itself would need to be modified to fit the Les Paul's neck angle.