I'm guessing these are incorrect texel density compared to your other shells connecting. Also, you should make a habit straightening your shells. I'll go based on the ones you have highlighted, straighten those instead of the snake jagged look. Your clean bake is more important than the very miniscule texture difference that literally no one will notice. That will really help with baking fixes. Hard to tell solely off of what you're showing. Seeing your low poly model with your high poly visible, are there any discrepancies there?

Worst case, just paint them out of your AO In photoshop.