Wrath-Amon and Cartoon Serpentor Compared
Serpentor and Wrath-Amon were characters who were pretty similar in design and personality. Both of them were synthetic organisms, not real human beings. Dr. Mindbender created Serpentor from the DNA of some of the greatest dictators in history. Wrath-Amon was created by Ram-Amon (and Conan ended up merely changing how Wrath-Amon was born) but he one day overthrew his creator to become leader of the Snake Cult.
Now we have both of them actually serving greater masters. Serpentor is Golobulus' puppet emperor for Cobra. Wrath-Amon IS the high priest of Set. Both of them are tasked to take over the world to make sure that their masters can take over it. Serpentor must conquer humanity for Golobulus while Wrath-Amon must gather Star Metal to allow Set to take over the world.
Final fates? Well in the G.I.Joe cartoon had Serpentor turned into an iguana. In the Conan cartoon, Wrath-Amon was devolved back to what he really was, a gilla monster.