I concur with everything that Paul has said.


You can examine settings in your documents using Shift+F1 and clicking the checkbox at the bottom about Style source.
Word's Reveal Formatting Methods



If in one document, there is a style format and in the other a direct format, that can be the source of your problems. Word will normally use the style definitions already in use in the destination document.

All three documents have the exact same style settings, as well as the same (tremendous amount of) direct formatting.

On the contrary, Normal Style, for example, in:
• 'Part 1' is defined as 24pt Arial with a 0.5in 1st line indent.
• 'Part 2' is defined as 12pt Times Sanskrit with 0 1st line indent.
Changing the Normal Style's font in the 'Part 1' to 12pt Times Sanskrit should resolve the font issues.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]