I dont know about the front end, but i am 99% sure that the 7.5 is an unchanged rearend. They used it from 79 to 2008 in any stang that wasnt a v8. (maybe longer?? but i doubt it the new v6 is a mean motor)
I remember reading about there being some differences in the flare nuts for the brake hoses between the fox cars and the SN95 cars. You might want to check the threading and sizes between the two nuts.
There is a reason why Ford Racing sells fox-body specific front lower control arms and SN95 specific front lower control arms. I know that if you use SN95 spindles, you will have to use a spacer between the Fox balljoint and the SN95 spindle.