A great article by Daniel Cubias does a good job in pointing out the differences.
Día de los Muertos Is Not Halloween
El Día de los Muertos
A Beautifully Rich Celebration where one celebrates the life of deceased loved ones and you get to share another meal.
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Día de Todos los Santos…All Saints Day
Traditions in some parts of México to celebrate from October 31st through November 2nd.
From The Pews 