Hi chaps quick question ,

sourced all the hard ware for my 02 bugeye wrx to retro fit a ppp kit now I'm searching for the ecu and done research and found the 03-05 ppp map was the ecutek map (261) was better than the chipped (245hp) map the bugs had,
my question can I simpley buy a 03 blobeye ppp ecu and fit this straight into my 02 bugeye?
It comes with transponder and key etc but I plan on local dealer matching my existing key for £42 .

Any help please .