Basically, except for pin 6, the rest should line with the same pins in the ECU.
once you take the JDM ECU and plug into the USDM harness, you have direct access to pin 8, while with a Japanese complete car, you'd have to bridge two pins in the check connector, to gain access to pin 8.
I am reasonably sure that "data link connector" is the OBD2 connector.
And as far as the rest, All the lap-top based systems work, they probably use the same pin. I also had the Ecutek data monitor and mine worked as well.
As far as OBD2 standards, there are several ISO protocols and they may use different pins.
Maybe some scanners are multi ISO nad those work and some are not so universal and don't, I'm not sure.
I saw that my Innovate OT2 does not work and my Easyscan does not work and yes, I have received several reports that several handheld universal scanners do work.