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Building a Robot with Arduino outdated components list

The online parts list for the book, Building a Robot with Arduino, is hosted on O'reilly's site and is supposed to include a link to a Motorshield at Makershed. But the link instead points instead to a version 2 of that shield, and the product description for that item indicates it is incompatible with the kit this book is sold with. Is the link incorrect, or is the item a suitable replacement? What is the incompatibility issue?
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