I'm not sure that is correct. If I remember correctly it was the league abbreviation that you needed to change. If it was anything but AL or NL the team would not be imported. Of course it may gave changed but I don't recall having to change team ids. I think you still need to change the league abbreviation in the teams, batting, pitching and fielding files to AL or NL for players to go to their correct team as a rookie during 1871-1900.
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