is there a difference between a jdm and usdm obd2 gsr engine wiring harness? reason im asking is someone bought my obd2 gsr harness on ebay and hes trying to tell me theres no plugs for vtec. now i didnt pull the harness myself but i know the gsr it came out of was working fine with vtec so im wondering if maybe he has a jdm motor hes trying to put my usdm harness on?