I have not really played that game, if you rip the graphics and music; it does not necessarily make game play the same. if engine is not made by same people, the developer might decide to improve on original, or he might not know how do something so the game ends up being a bit worse.
If how he has original code program, and its written in language that not too complicated to read he can convert game line by line. to make a game that is a 1:1 conversion, more likely it be slightly different.