[Pharo-project] Image size

Hi, I have problems in understanding the image size of pharo. I monitored it since we started and I did not recognize a notably change. So I took a pharo 10073 and squeak 3.10.2 for comparsion. Amount classes, amount methods and lines of code are all 10% less in pharo. But the image is approx. 0,5% - 1% smaller than the squeak one. To clarify this. I closed all windows and did condenseChanges and garbageCollect, flushed the monticello cache... What could be the reason for this? thanks, Norbert