Both books cover heraldry, but Edupress actually gives more information and activities on castles, knights, and tournaments. Both books have reading lists for children. The Edupress book has 48 pages and is 6.95. These are aimed at primary age children, and contain activities, crafts, and history. Text is large and easy to read for young eyes.
Pictures are simple, large, and bold.
Crafts are illustrated and are simple enough for primaries to do. Title page has Table of Contents and a Time Line. 24 indexed pages each. Mention both series and title when you order. These focus on crafts and activities.