not completely. the rear tops are different.
The BD has the same rear tops mounts as an 02-07 wrx and that stuff will bolt right in. however, the suspension geometry of GC parts is a better fit. Ideally you would use GC suspension with GD rear top mounts.
For the record I am using 04 sti suspension with RCE springs and it's a direct bolt in, but I had to do some work to get the alignment where I wanted.