The new ability to configure columns for Z39.50 results applies when creating a new record via Z39.50 but it does not apply when already in the Advanced Cataloging Editor and executing a Z39.50 search. The column configuration should apply to both ways of searching.
Both are different implementations/code/pages. I think it would be better to have separate configuration options for each. It would also be more flexible. I am updating bug 27001 too.