Most of the stuff swaps over, not sure about the suspension stuff as I have not actually ever done that. It probably will but if you can return it I would. If not then try it and if it doesn't fit then sell it.
As far as swapping the motor/trans/driveshaft and mounts. They all swap over with a few gotchas. You'll need to mess with the IAT sensor location a little and the front covers/accessories are different. Also the throttle body/egr assembly and the upper intake are different setups. If the 95GT you have has a motor in it you can just swap all the 95 stuff over or you can use the fox intake/tb setup.
Now as far as the trans/driveshaft... like I said they will fit. But you will need a 5/8" driveshaft spacer and your shifter will sit further forward. Since these cars are known for having issues with reaching for the shifter, this is not exactly ideal. However you can buy a Steeda shifter relocation plate (for the any TKO or any Hurst shifter) and modify it to fit any shifter with some nylon spacers. You will also need to use your fox bellhousing and clutch fork if you use a fox trans. You may also run into crossmember issues and driveshaft alignment with this setup but you can always buy a Stiffler's one that will have enough adjustment and shims to probably be fine.
Exhaust all bolts up but you will not be able to use EGR which is not really an issue but you will need to tune it out.
Electronics wise everything pretty much just bolts up especially since you have a donor car just use all the 95 electronics and anything that isn't quite right on your fox motor just swap the SN95 part from your 95 to it. I will say that the 94/95 computers suck *** tho... you can either tune them or you can put your fox ECU in which will need a minor re-pin along with a standalone fan controller and BAP sensor. I have the diagrams and I can post them when I get home if you need them. I highly recommend swapping to the fox computer.
So in a nutshell, yeah you can swap most/all of your stuff but its not 100% bolt in. It is close tho.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.