same k series engine...but i heard that there are k20a, k20a1, k20b blah blah, not sure about that. but japan or europe version usually is the better due to north america strict emission requirement. i know people always ship jdm car into US .
No. It isn't the same. Japan dc5r is using k20, no moonroof so lighter, using racing seat and brembo braking system. usa has two versions, newer and older. Newer one is using k20z1 which is similar to k20 but no LSD and rev limit is 8100rpm. And it is using dc5r intake manifold and cam. Final drive ratio is same with dc5r 's. So newer version is almost as fast as dc5r but little heavier. Older version has lower hp and tq and no LSD too and rev is up to 7800. It is using k20a2. It wasn't using any dc5r cams or others.