Photo jpeg size is slightly reduced

Hello,
I recently downloaded a photo from a web on my laptop. The size of JPG file was 431,606 bytes. Then I downloaded the same photo on iPad and lately copied it on my laptop. I found out that the size of JPG file comming from iPad was slightly different: 420,912 bytes.
I checked and found out that the photo resolution stayed the same.
Why the size of JPG file comming from iPad is diffrent? What has been changed?
Thank you in advance
Sergei

Dear IIIaass,
Thank you very much for your reply.
Yes you are right - if you sync photos from a PC, iTunes optimises them to match iPad screen resolution.
Here we have a different situation - I save photo from a web or E-mail and as I understood the JPG file should be preserved. But it is not the case.
The reason I am asking is because I would like to purchase iPad camera kit and use my iPad during vacations to backup photos from my camera. I would like to be sure that the quality of copied photos remain the same and critical information is not removed from the JPG files. I suppose that iPad uses the same approach for coping files from the camera kit and web.
Thank you,
Sergei.

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jpeg size is only2.8ish meg when exported from
aperture, as apposed to a file that was exported
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