Does a D&D Monster's power level (damage dealt, hit points it has, powers effects against PCs, etc) transfer over well enough for the encounters to be balanced? Gamma World only goes up to 10th level. I tried calculating monster HP with the original DMG 4e rules and the HP was the same as each creature I tried to calculate for, all except for a 10th level solo which had 400 hp instead of the 424 I calculated using the book. Wanted to create some new monsters for Gamma World. Has anyone else used D&D Monsters or created their own in a balanced way?