Is there a difference between subpectoral and submuscular for breast implants?

No, there is no difference between subpectoral and submuscular for breast implants. Breast implants are usually placed in this position to give a natural look. Subglandular implants are implants are placed over the chest muscles. The implants can be more visible.  Visit a board certified plastic surgeon for a consult.

The terms subpectoral and submuscular are used interchangeably. There is no difference.I would suggest you find a plastic surgeon certified by the American Board
of Plastic Surgery and ideally a member of the American Society for Aesthetic
Plastic Surgery (ASAPS) that you can find through the Smart Beauty Guide. You should
discuss your concerns with that surgeon in person.

Robert Singer, MD FACS 

La Jolla, California