I need this answered as fast as possible!!!!!!!!!!!!!!!!!!!!!!…

hey guys if you remember pokemon RED and BLUE were the same game just with a little twists, now is DIAMOND and PEARL for the DS like this????????? or are they different and if they are is it worth it to buy both?????? ONLY GOOD COMMENTS PLEASE! dont be an azz ANSWER SOON PLEAZE!!!!!!!!!!!!!!!!!!!!!!!