Your screen shots only seem to depict the kind of text re-flow that happens whenever a different printer is active. This could even happen on Macs and is perfectly normal with Word documents, since Word queries the active printer and uses data returned from it to optimise the page layout. The result can often be seen in differences in line-wrapping and pagination. You should check too that the fonts used in the document are actually installed on the PC (or at least embedded in the document); otherwise Word will substitute other fonts and that will likely cause the text to flow differently.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]