What is the difference between the USDM and the JDM control unit.

Looking at this one below.

http://www.ebay.com/itm/JDM-INFINITI...item27c5e51863

Says the JDM is required and I'm wondering if anyone has pictures of the JDM unit next to the USDM unit. Or measurements.

Thank you!

Looking at the stickies would have answered your question:
This is the reason why you need the JDM a/c controller

Please search a little before making a new post.