Ok we have some competing information in this thread.
The OP wants to know 3 things:
Do the 08 base Imprezas have the same brakes as the 08+ WRX: no, the front calps are bigger on the WRX and the 08 2.5i has rear drums and 09+ 2.5i has rear discs
Do the base Imprezas have the same hubs as his 2011 WRX: yes
Finally, will the 16" steelies from an 08 Impreza fit his 2011 WRX: he will have to make sure they clear the front calipers. BUT there is definitive proof the 2.0L WRXes 16" wheels fit the 08+ WRX brakes, so that is a known. The 08+ 2.5i steelies may or may not depending on the clearance to the front calipers.