thanks Tomas
1. If you are replacing actual .ai file/part (which is in the projects panel). In such act, you are replacing the single item, which is referenced in all duplicated comps. Meaning, all comps are pointing to that X item, and its replacement would cause change in all layers.
This is exactly what’s happening, yet I have duplicated within the project panel which I thought was the correct way.
I guess I somehow need to duplicate the .AI illustration and relink this to the duplicated comp, so I have a duplicate of both the comp and the artwork contained within the comp.
How is the comp file linking to the .AI artwork? How can I change this?