with each other as far as I understand. Same goes with Euro models. All three have a different identification system.
Canadian spec cars also do not show up in the USDM database but I believe their Vin's do go in line with USDM. For example, if there is a break/missing vin in a USDM production vin sequence it is likely that it is a Canadian spec car. I haven't been able to fully confirm this but so far from the Canadian vin's I've looked up and compared with the USDM this appears to be the case.