I am 99% sure that the answer to your question is no. From what I remember, if you have added profile fields, you had to re do your member list. I guess you could manually fix your profiles, but that would be a lot of work. It is possible that someone made a utility since I upgraded...but I did not notice it.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.