Yes, the 2005 and rear bumpers are different and are not a direct fit. I made some assumptions when I posted and that was a mistake. -Cutting off the year with 2005 models made no sense to me so I assumed that through 2004 was intended. -I have replaced lots of front bumpers, so I didn't consider the rear.
Now as penance, I'll be more specific.
2005 (987) bumper covers will not fit at all without lots of modification. The top edge of the front bumper is entirely different due to the lighting and frunk changes for the 987. The top edge of the rear 987 bumper covers the sides of the tail light and the spoiler is shaped differently.
2003 - 2004 front bumpers are interchangeable to the 1997 - 2002 cars. The trim for the grills is different and not interchangeable.
2003 - 2004 rear bumpers are different from the earlier models because of the change to the spoiler.
...and now I leave you with this:
Official 986 to 996 Front-end Conversion Thread