IPhoto Library Manager--File Size difference of merged library

I just use iPhoto Library Manager to merge 2 libraries and it worked great. There is a huge difference in the size of the libraries. The original library is 17.48 GB. The merged library which had an additional 4.03 GB of pictures/events added to it is only 11.28 GB. I would have expected 17.48 GB + 4.03 GB to add up to 21.51 GB. Can anyone explain? What has been lost?
Additional info: I get the same 244 events and 4426 pictures whether I open the iPhoto Library or the "Merged Library" through the finder window.
I have iPhoto 7.1.3 and iPLM 3.4.2 installed.

Do you sync your photos with an iPod using iTunes? If so this creates a cache file that can be very large indeed. It would not be carried over in the Merge.
Regards
TD

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