Well, hopefully they are not meat birds. From what the other thread said they didn't look like cornish x because they had nice feathers and their legs were not stocky. What were they supposed to be?
How old are your birds? If they are meat birds they will be a lot larger than laying chicks are at that age. Why don't you take some pics of your babies, tell us the age and maybe a little more about them. I don't know anything about the cornish x, other than they taste good. Tastes like chicken...