Encoded file sizes different on two Macs

We've just encoded a file to MPEG2 and the encoded file on Mac 1 is 1.58 GB and I've received it on Mac 2 via DropBox and the file is now 1.7 GB.
Can anybody explain why this is?

Does it play the same on both machines?
If so, don't worry about it. File sizes are reported differently based upon
a. the hard drive sector size. Smaller sector sizes means less wasted space in less than full sectors.
and/or
b. how the OS reports MB. - iirc, OS. 10.6 uses 1000 kb to the MB - while 10.5 uses 1024.
x

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Encoded file sizes different on two Macs

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