The green one doesn't plug into the ECU, it plugs into a female connector near the ECU area of the passenger side kick panel. The 3 ECU connectors are 2 grays and 1 blue. The reason why that OBD2B engine harness is missing a gray connector is because of what I told you before. That third...
You're going to want to use an OBD2B harness because facelift EKs have the ECU plugs split differently than OBD1 and OBD2A. OBD1 & OBD2A have 3 connectors from the engine harness to the ECU while the OBD2B has 2 ECU connectors from the engine side and the third connector comes from the dash...
It will work and you can drive perfectly fine. However, you will not have ABS because the ABS driveshafts have the toner ring at the end of each driveshaft for the sensor to detect.