Create an applescript to automate PDF compare?

I need to create an applescript to automate comparing B4 and After PDF. Can this be done with applescripting.

I know of no way to automate it. The PDF that you see really only exists on the screen. The internal structures that define it have little or no connection to the display. For example, if you open a Word document in a basic text editor, in between the special characters you can still read the text. You can't do that with a PDF. A PDF that appears to be entirely text may not contain any text.
You would have to develop a system that exported text and compared the text. Such a system would fail more often than not. You could instead create a system that exported each PDF as an image and compared the image. You would likely get false positives but it should work.
Adobe claims to have a diff feature in Acrobat Pro: http://www.adobe.com/ca/products/acrobat/file-compare-two-pdf-files.html
There are some open-source tools as well: http://www.qtrac.eu/diffpdf.html
Good luck with either.
If you are the one making the changes, you could use Preview's browse versions feature to visually compare them.

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