Mitch Dunefsky is one of these persons who can order direct from Japanese Honda dealerships. Anyone with a Y1 will be hard pressed NOT to stand on the gas and start smacking through gears. Clutch is cable, not hydraulic. No difference from Dx there. Had to swap out throttle cable for a '90 Integra unit.
Drive axles are custom, sadly enough.
And one with a white plug. Whether they have different resistance and such I don't know, didn't measure them. So I can't tell you if putting two US green ones will work or not. Thing to keep in mind though, the JDMspec ecu does expect two O2 sensors. They are NOT located on the downpipe as with your standard issue DC or other such aftermarket header.