Yeah, I looked them up out of curiosity after posting. They look pretty similar. In CanUS, most LATCH seats use a lap belt with clips on either end to connect to the anchors. This lets you slip it between the upper and lower parts of the seat more easily. Looks like ISOFIX is designed so the seat latches right to the anchors, and there is a removable part of the seat that exposes the anchors. The top tether in Europe usually goes to a roof while it is usually on the bottom of the rear part of the seat in CanUS. I think the Euro implementation would likely minimize installation issues, which was the whole point of both standards. To get the lap belt tight enough is a real pain, so they get installed wrong a lot over here. Apparently there are LATCH car seats that also connect directly to the seat anchors, but I have never seen one. Seema like it would be rougher on the interior given how we hide the anchors over here, but it would probably result in fewer bad installs.