Do breast implants drop and fluff at separate times but still end up "matching" at the end result? 13 days po (photos)

 Congratulations on having undergone the breast augmentation procedure. Your plastic surgeon will always be your best resource when it comes to an accurate assessment of your situation, advice, predictions, and/or meaningful reassurance.
Generally speaking, breast implants will "drop" into the pocket that was created during surgery and massaging the implants downward may assist in the dropping of the implants after surgery (for those patients who want to help with the settling of the implants).  The rate of breast implant "settling" may depend on factors such as size of breast implant pocket dissected, tightness of the overlying skin/muscle layers, size of breast implant utilized, and concerns such as pre-existing breast asymmetry. Normally, it takes about 3-6 months (for some patients longer) to see the final result. It is very common for one side to settle faster than the other.
Sometimes, one or both breasts implants do not settle as planned and revisionary breast surgery becomes necessary to improve the outcome. On other occasions, if the long-term breast asymmetry is mild ( understanding that absolute symmetry is very rarely achieved), patients will need to decide whether proceeding with revisionary breast surgery is worth the potential downsides associated with additional surgery.
Again, best to follow your plastic surgeon for more specifics. Best wishes for an outcome that you will be pleased with long-term.

Yes, it is possible for implants to drop differently. At 13 days you are only about 10 percent dropped, softened, and shaped. "Drop and fluff" refers to the fact that as the skin stretches and the muscles relax, the implants move down and out slowly – about 1 percent a day. It’ll be about six weeks before they even begin to settle down, but they’ll be close to 80 percent settled at three months. Watching their progress is like watching your hair grow. You don’t see a difference in your hair growth daily, but all of a sudden you need a haircut. 
Be patient after surgery. Give yourself a few months before making a judgment about your surgical results. You won't know the outcome until then.
Dr. Ted Eisenberg, Board Certified Plastic Surgeon and Author

you are early in your post operative period. It takes 4-6 months for the implants to settle and even out. It is not uncommon for one side to heal faster than the other.