Aperture Library size different after restore from TM and rebuild Thumbnails

I have just completed an erase-install-migrate from Time Machine using Setup Assistant.
The size of the managed Aperture Library originally was 397.8Gb
After completion of the migrate back in I opened Aperture and as expected it rebuilt the thumbnails (TM does not backup the Thumbnails).
After doing this I tested the Library as far as possible and all seems well, and the number of photos is exactly the same as before (49,883).
However, the size of the library is now 357.8 Gb.
The only logical explanation (to me) is that the restore process has eliminated previews and thumbnails from photos which I have deleted over the years.
I still have a backup of the original (397.8Gb) version which I could put back with the Finder, but if the restored library has cleared years of redundant previews and thumbnails I would prefer to stay with that.
All done with Mavericks and Aperture 3.5.
Any insights very welcome.
Thanks

Just had the idea of looking at sizes in the Library package contents, and the explanation for the change in size is due to three things:
Thumbnails old: 44.95 Gb
Thumbnails new: 15.13 Gb
There is also an iPod photocache of 14.6 Gb which is not yet present in the new.
However Previews old was 27.95 Gb and Previews new is 33.18 Gb, so I assume some previews were smaller in the original Library.
Masters is 304.3 Gb in the original and new libraries.
I am beginning to feel more confident about the new library.

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