Why do re-downloaded purchases have different file sizes ?

Hi,
I re-downloaded my iTunes purchases again this year onto the same PC.
I was quite surprised that the filesizes were not exactly the same as the first time in 2013 - I would have expected a movie or TV programme to have a specific size.
What is causing that difference between my original 2013 downloads and my 2014 downloads of exactly the same files?
As an example, I have highlighted a file in the Homeland series, season one. But you can see the differences is on every file comparing 2013 and 2014, and the same is true for my movies.
Hope someone has asked this before, or does actually know!
Flobbyblob

Hi dymar,
Copying to another Drive is understandable, they may have a differentnumber of Blocks allocated per file, for insnce a one Byte file might take up 512 bytes, 1024 Bytes, etc, but a Get info should show the actual size of the file within that/those blocks.
If copying to another Format, like MS-DOS, Forks may be lost also.
There are ways to actually Compare the files...
http://www.hutsby.net/2008/01/apple-mac-osx-compare-files-and-folders.html
http://www.deltopia.com/compare-merge-sync/macosx/
http://www.macworld.com/article/49584/2006/03/cmpfldr.html
http://www.araxis.com/merge_mac/index.html
Or the most expensive one & my favorite, but far more useful, Tri-Backup...
http://www.tri-edre.com/english/tribackup.html

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Why do re-downloaded purchases have different file sizes ?

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