My son, 16, also has an IEP. The school system he is in also integrates the students. Now being in tenth grade, I can honestly tell you he in no way feels nor is treated any different with behavior or learning. These kids learn different is all.
Example: There are two “ways” you can drive to school. One is highway, more direct, the other is side roads, many left then rights. Our kids live on the back road direction.
If your school system is worth his/her future self, there is NO difference. Only their special educator comes to them when their hand is raised bc they are confused.