the location is the same, however the dp will fit the same from one manifold/turbo to another.
if you are going to run a downpipe/testpipe in one, such as put a section of flex pipe on the end of the downpipe were the cat would normaly be. in that case it will all be the same
it shouldn't really matter. if it is too short all you need to do is weld a piece of piping on to lengthen it. I would make it off of your dp assuming it is the same manifold and turbo, and if it is too short you can lengthen it easy