Does Replication Cockpit in Data Integration captures only new entries being added or structural changes to tables as well

Interesting question. My guess is that yes, it will do, as long as it is not a PK column. Of course, previous registers will not have that column. And of course your transformations to put data from that table to the process model will not include the new column.

But I'd love to hear from anybody that has tested this, of course.