there isnt any difference in the carbs.....they all work dude...
maybe u can get a diff carb at the time of purchase...at my lhs i bought an engine and they swapped the carb for me
FG leopard comp w/Trevor Simpson 28.5 bzm crank
HIP Baja 5sct
AE tc5 3.5t speed monster,Futaba 4pks
Raptor G4 ,Raptor e550,Gaui x5,Mini titan v2,Precision aerobatics bandit 4s monster,Carbon z scimitar Jr 11x