What's the difference? The first is TV and the second is H. Anything else?
Mangaka-san to Assistant-san to
>A life description about the mangaka Aito Yuuki and his assistant Ashisu Sahoto. Aito doesn't understand the feelings of the characters in his stories so he asks Ashisu to help him. Ashisu would do anything for the work—she will even let him touch her breast so he will know how it feels like?! The Habit?! The Pervert?! Can we understand them? That's the comedy of a mangaka life.
Eroge! H mo Game mo Kaihatsu Zanmai
>After playing through Flower's first title, Tomoya realizes that his co-workers don't know anything about eroge, lacking the insight and understanding needed to make a good game. After some nudging from the president of Flower's parent company and some soul searching of his own, our protagonist takes it upon himself to save Flower by teaching the four girls on staff the ins and outs of what makes an eroge good. The story thus focuses on Tomoya's role as a psuedo-consultant while getting to know the four heroines of the story as the player is given an interesting look at the world of eroge development.
Well in eroge MC bangs all the girls. I don't think that happens in the other one.