Depends if they are what we think they are !
As I said the FS profile points are extrapolated into 'expectations at the end of KS1', so they will be telling the teachers where your son should be at the end of Y2, on the basis of his achievements at the end of YR.
As regards any special needs, I certainly wouldn't rely on scores. Your child's teacher will be aware if he is having difficulties. YR teachers are making observations of the children all the time and know them like the back of their hands! Talk to the teacher and file the results in a drawer - you never know, you may need them.
Saying that, if FS profiles haven't been completed by the end of the Spring Term in Y1 (i.e. the child is not yet a 1C), that flags a special need - intervention programmes should already be in place by then, as the teachers will be aware of the children's needs.