I'm just brainstorming at my computer here and can't really tell you if this idea is truly practical or not, but:
Define two additional fields in your table. Define one as a calculation field that concatenates the values of the other fields:
Field1 & " " & Field2 & " " & ... and so forth for every field that might be modified by the import matching operation.
Define the second as a text field. Just before you import records, use Replace field contents to set the added text field to the value of this calculation field. Then import your records.
The records that have been modified by the import will be the records where this added calculation field does not match the value in the text field. (And newly added records will have an empty text field.)
That works just fine - thanks. That will tell me the record has been updated, and with some work, I can do some parsing between the two to uncover which Field(s) changed. Best yet equivalent for a Field Script Trigger of 'OnObjectModified_ByImport.'
Thanks again, and thanks for the fast response.