Eh, 9 times out of 10 this is good advice. But if the imbalance is as significant as it appears in this picture I think it may only grow worse over time.
Typically getting bigger is the best answer for asymmetry in muscle shape, with muscle size I would expect some corrections to be necessary or it would get worse.
I don't have the right answer.
OP - are strength levels the same for both sides or does 1 side consistently fail before the other in your dumbbell presses?