ZZP headers were the TOGs design but better. They evened out the runners ore, and smoothed them out better. In the end they cost about the same as the TOGs and supporting mods around them, so you might as well go ZZP headers if you choose to go the TOG route.

If you read up on the articles about developing the ZZP headers it says Zoomer had a meeting with one of the makers/owners of the TOGs in which they agreed that Zoomer could start making the design. He developed them even further.