On the driver side apron on the top is a VIN number, this number will decode it.
And yes the floor is the same in most aspects, it will work. I put a complete floor pan in from ThoroughbredGT in mine. It is completely spot welded together with frame rails trunk pan with drop offs.
It is a very nice piece, expensive but worth it when you figure in all the labor to piece all the stuff together, and time assembling it. Plus it is put together on a jig so you know it's right on. Fit like a champ as well.
If you have to replace it all this is the only way to go.