The E body trunk pans break down into the standard category, 1970 is a 1 year deal, 71-4 grouped together,...

while the pans are identical in shape and size, plug holes and shock holes will remain the same for the corresponding years in the two groups above,...but the challenger pan "if cut" for the fuel neck will be on the passenger side of the floor, where as the Cuda filler tube hole is rearward,....being NOS the floor may/may not have all the holes/openings cut open, which would be a bonus for you as well as being 1970 as well,.. as the shock plug holes are located on top, but all the impressions/ribs/etc are the same between the pans, it's just a matter of what holes were punched out depending upon the application, worse case using the challenger pan is welding up the fuel tube opening if it's been punched? and relocating a hole in the rearward boss...