I have an idea and a theory of how this could work (I have not tried it):
1. Save both versions as IFC files.
2. In a new ARCHICAD instance, use the "File\Interoperability\IFC\Detect IFC Model Changes" menu command. In the "Older version" field, select the file that still has those deleted elements, in the "Newer version" field, select the file having the deleted elements.
3. Click the "Next" button and import the IFC files, and the Wizard will detect the differences between the two files and color code the deleted elements for you, I think.
This is the best idea I have right now for this.
If you try it, please let me know how it went.
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