The cost should be comparable given the time period it was placed and the initial type of implant that was used. Some implants are harder to remove. If it was a silicone type of implant placed under the chin, then it is a relatively easy procedure to replace the implant with a smaller one. Other types of implants might be more difficult to remove necessitating higher costs. It also may be less expensive to go back to your original surgeon.
Hi there and thanks for your question! The cost of replacing your chin implant to a smaller size will vary by surgeon but should be around the same cost as your initial surgery or even less. I recommend seeing an experienced plastic surgeon for more information. Best of luck!