Probably NOT - but impossible to answer.
When you lose weight (and breast fill), the breasts become deflated. To get them to where they were, or better yet, to a better looking point, the emptied breast envelope has to be filled to the desired point. No More.
SIDE BOOBS - refers to the appearance of full breasts whose base is too wide to maintain flat-fore ward facing footing and projection. Instead, they slide sideways ESPECIALLY in narrower chest and especially pigeon chested women.
So, the question for your plastic surgeon SHOULD BE : based on my chest wall appearance AND the amount of my breast tissue which breast implant (diameter and projection) would best be covered by my breast tissue and stay on my chest wall (without falling sideways)? That analysis is not provided by the measurements you gave us and needs to be looked at by your surgeon.
Generally speaking (meaning it may not even apply to you), in most but the most narrowed chested women, a deflated breast will do better with EITHER Mentor moderate Plus (style 2000) or Mentor High Profile Gel implants (which have a slightly wider base) than a high profile saline implant (either Allergan or Mentor).
I hope this was helpful.