Even less work, someone cleaned up this part:
if you do a delete minus on the part it will delete the part bu leave the traces, You can then load the new part you may need to delete the old part if the moduleId didn’t change to load the new part though and then shutdown Fritizing answering yes to save parts and save parts bins then restart Fritzing (that is required to really delete the part!) then load the new one. You can then drag it in to the sketch and drag the traces to the new part to connect them.
Peter