yeah, but the difference is in what the intent is, you want to make something new, he was to make 'his own' version which could be for several reasons, such as adding his own ideas and features or maybe just for the challenge of doing so. I remember my first big project with game design was with game maker, I set out (and for the most part accomplished) remaking mario bros 3 (not the levels but all the same features) the physics were all correct, the sprites worked correctly, the power ups were set to the same, even the green turtles walked off ledges while red ones walked back and forth, it was a huge accomplishment to me at the time because It has been my favorite game since i was 3. On top of that, using my system somebody could design there own levels just taking my source file in gmaker and only touching the level design area with no hassle so i built all sorts of fun stuff into the game.