If you already have butt implants, can you get a BBL?

Hello dear!
Thanks for the question and provided information as well.
Yes, you can. To be a candidate for plastic surgery, in general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 33 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

If your buttock implants are intramuscular in position, then you can safely have fat injections done secondarily.