They are WAY different.
- The lens is glass not plastic
- They use a 2 peice design inside (reflector and housing). USDM is one peice
- The headlight is one piece on the outside, there are no stupid a-- metal brackets and alignment BS. That is because the USDM lights need to adjust the whole light. The EDM/JDM adjust the reflector housing inside, so the lights always fit perfect.
- They use H4 lights instead of 9004 bulbs
- They look 10x better
Buy my JDM set if you are interested in better lighting and better looking lights. The lenses are plastic, but that is the only difference between the UK ones and the JDM ones. The plastic is very clean though and does not yellow as much as the USDM stuff does.
http://www.mx-3.com/phpBB3/viewtopic.php?f=2&t=68906