Yes OB act the same as YB, again OB is just a different line of YB just like the Goblin is (Ralph's Line of YB).
I produced a Black Pastel Orange Belly last year, and shooting for Mystic Orange Belly this season. (I work with OB)
The only thing that differentiate the OB is that they can potentially produce the Ultra Ivory and Graphite. After talking to Ben a few times he believes that there is another gene attached to the OB and that it could be recessive (explaining why not all OB produce Ultras or Graphites), not sure if his theory has been proved out yet, you would need to contact him to find out more about it.
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