The functioning is completely different. Please take the time to read it from their website.

What's the matter? I thought you were interested in this topic! Now that it's time to go into the actual details of the system you get cold feet? I think you'll find that the parts that actually matter are exactly the same. Nodes relay arbitrary encrypted traffic from an unknown source to an unknown destination. The biggest difference between the two is that EVERYONE relays traffic, not just people who specifically volunteer. Sorry, but that model just doesn't work.