First off if its another 02GT it did not come with a black interior as those were not available that year unless someone swapped it with a 94-98 interior at some point. Also no GT came with a T-5 after 1995 and the T45 stopped in 2001 so it isn't one of those either.
So if it is another 02 GT it will have the same interior and same trans as yours. Now if there is something busted up on yours that you need from that one then get it. If there is any interior part that is better like door panels or the carpet or anything get that too. And obviously any aftermarket parts that you might want you should pull before it goes to the yard.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.