There are many differences between the two species, I don't even know where start. lol
Though they can be kept similarly. There's a brief care sheet on this link that covers both species.
GiantGeckos.com - Captive Bred Reptiles by Philippe de Vosjoli - BASIC CARE

Most all Cranwell's lose their green color with age. Samurai Reptiles produce pacmans that are guaranteed to hold their color, they are pricey though. Of the commonly available pacmans the Ornate horned frog tend to hold their baby colors into adulthood.