Approximately five months after the MG Gundam Deathscythe was released by Bandai, they released the Deathscythe Hell from Endless Waltz. Major difference from the former is the addition of the wing parts plus having a different color scheme.
If you feel duped that Bandai released two versions of a slightly different mecha in just a span of a few months, console yourself with the thought that this is a lesson to practice restraint when purchasing so as not to fall to the similar trap again in the future. But if you don’t feel duped and are just happy as a clam that Bandai released two slightly different versions of the Gundam Deathscythe, then Good For You! *snicker*
Color Guide and Construction Manual for the MG XXXG-01D2 Gundam Deathscythe Hell was translated to English from the Japanese manual posted at Dalong’s Gunpla Review site.