That would depend on where the sucker originates.
If you plant the brown turkey deeper, the brown turkey stem/trunk will get roots, and may also shoot up suckers, that will be brown turkey.
you would have to check to see where the sucker originates, if it is below the graft point it is something else, above the graft point then it is true to the turkey type.
Grant
A question to more knowledgable members: Why would someone graft a fig when they are relatively easy to propogate from cuttings or layering?