Restored library from Time Machine Backup SIGNIFICANTLY smaller - worry?

Original file size is 235 gigs and recovered is 186.
I woke up yesterday and got a message that my iphoto library was corrupted and needed to be restored from backup. My husband had done something to the printer recently, and I had got an Ipad the day before as well, so either of those things may have had something to do with it, I'm not sure.
Anyway, I verified the internal (and separate) drive that the photos were on and ran it was fine. I restarted and the computer and that didn't help. So I opened the folder where the library was located, then I opened time machine and clicked on Restore and chose the option to keep both libraries, since there was enough room on the drive.
After the restore was complete, I was fortunately able to open my photos. Everything looks normal, but I have 15 years worth of pictures here, so I really have no way of knowing if they are really all there or not, and I didn't have a count before.
Should I be concerned by the filse size difference, or is this likely optimization?

Thank you for your reply. I did what you suggested and compared the Original and Modified folder sizes. They were exactly the same. In fact, I compared ALL the folder sizes, and they are all nearly identical. (I have been poking around in there, so it makes sense that they would be not quite the same.) The ipod photo cache was still there.
I found another post that showed me how to rebuild my iPhoto thumbnails and "uncorrupt" my original library, so I'm going back to the the one with the bigger file size just to be safe. But I've backed up the old and the new version onto external drives just in case.
Thanks for all your help.

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