I think they both farm out the engine work, heart of the bike.
I have a lot of respect for the skills that Jesse has, but I don't fault OCC for being less hands on. I can buy one hell of a house built by a guy who didn't so much as touch a hammer. He knows the best carpenter, the best electrician, the best...on and on. Knowing the best to go to when you know you aren't the best is more important sometimes.
The frames and tanks they use are their designs, they've mentioned that before. Makes sense. On Leno, or some talk show, they said the sell 30-40 bikes a month. I assume that's a different division than shown on the show. Those guys are having all of the fun drumming up business. Plus, some steel business is where the real money comes from, I'm sure. Jesse sells parts too, as mentioned on the documentary, and that's what keeps him going too. He didn't hand build for his mail order business.
They all do something I can't, just not in quite the same way as each other. Jesse more custom fabrication, OCC more cool details.