For q2, they are treated no differently because they are dual enrollment. The only issue I would see is if you did them at a community college, and even then it is only certain schools that would have an issue with it. Tufts is one school I know that doesn't allow prereqs to be taken at a community college.
If your question was "do I have to report my dual enrollment classes from high school", yes, you do. Any class ever taken at a college needs to be reported.