We have both of the files back from Data Axle with the appended data. They will be emailing them to us through the FTP. Once we have the new fields created in Civi we can import both of the files back in. One of the files is ~113K and the other is ~500K records. There are extra fields in both files, but we will only be reimporting the ones listed in our document. The others are only being used for Delve.
Some fields will be new, which are the 'CE' or Consumer Enhancement data and the others will have an override update like DOB and Deceased flags. For updated addresses we can have them added as the primary "Home address" and if there is another address on the record move it to "Old 2023 address," so we can still keep the old data.
