Thank you for your question. The short answer is no. If you have breast asymmetry, without surgery there is not a way to correct this. Most women have some small degree of asymmetry which is normal. To correct it many times a breast lift, breast augmentation or combination of the two is used. Even after surgery you should expect some degree of asymmetry. Surgery is both a science and an art. Nothing is perfect, especially when correcting asymmetry. Make sure you see a board certified plastic surgeon to discuss all of your options as well as the realistic expectations when correcting asymmetry.
The answer is no, if you have significant on evenness it is not possible to even breasts without surgery. Even with surgery it will never be perfectly identical but they would be much much closer. I would recommend you find a board-certified plastic surgeonby the American Board of plastic surgery and be evaluated of what your options could be. Best of luck