Days of the dead and Halloween sound pretty similar considering Halloween and dead kind of match with the spookiness, anyway i'm going to explain some similarities and differences such as how they celebrate it , different foods and just in general how they are different because despite their similarities there more different than you think.
One way their different is how they celebrate it in mexico they celebrate Dias de los muertos (Days of the Dead) with a huge celebration with tons of food and la mascara (masks) unlike Halloween in which they celebrate it mostly at night with scary monsters, witches , vampires and more , in Halloween they also go trick or treating and you gets tons of candy , which days of the dead they don't
One way their different is how they celebrate it in mexico they celebrate Dias de los muertos (Days of the Dead) with a huge celebration with tons of food and la mascara (masks) unlike Halloween in which they celebrate it mostly at night with scary monsters, witches , vampires and more , in Halloween they also go trick or treating and you gets tons of candy , which days of the dead they don't