2 specialist plastic surgeons placing the same implant in the same pocket will pretty much get the same result.
Unfortunately there are no government rules on who can perform breast augmentation surgery. All you need is a medical degree. To guarantee your surgeon is highly qualified make sure they are a member of the Australian Society of Plastic Surgeons.
The art of breast augmentation surgery starts in the consultation room with the choice of the correct implant. If both the surgeons are well qualified, then you can be assured that both implants will look good on you. If you are unsure on which implant to use consult a surgeon that has 3D software.