So is there a difference between a plymouth roadrunner and a plymouth sattelite?

Yes, suspension, badging, engines, the hood, some trim of course, and the performance image. The Satellite was a basic B body from 65 on. What differences are you concerned with?

i was just wondering, since i have seen some people describe their sattellite as a "roadrunner clone"

Technically you could convert the Satellite into a RR with all the right pieces, just not a " real" car.