I'm thinking about the possibility that you just have to overcome the power of a Genie or Chaos to be able to knock him out or even kill him. Jafar Genius cannot kill anyone directly, however he knocked out the Blue Genie. If the Jinn could kill directly, Jafar Jinn could have killed the Jinn. In the best case scenario because the Jinn can transform into whatever they want, a Universal Destroyer is needed to be able to destroy them completely (including Chaos).
The big problem with this, is that due to the magic they use, they can cause a lot of problems even for DBS characters, but on the other hand, you just have to hit them to annihilate them and as we saw, even Jafar Genie doesn't have excellent reflexes, it's just seeing him as the Parrot managed to snatch his lamp from the lava.
So I'd say Kid Boo wins, the only option is for Chaos or Jafar Genie to transform into a Sun and Kid Boo catches fire.