i have no doubts about it. our legacy outback's front and rear bumpers are a couple of inches longer then the jdm and edm ones. it's to meet the US bumper safety requirements.
but looking at the pictures i don't see anything too obvious.
US-spec front and rear bumpers are the same as the EU-spec bumpers... Other than the side marker on the front bumper of the US=spec version. And i guess the european front lip are not standard on the US-spec front bumper.