I am not sure I understand why you are worrying about it. The amp doesn't really care about the sensitivity and you adjust each speakers output via the speaker setting in the amp to match the other speakers. The speaker sensitivity has no bearing on its output so far as the ability to set them to reference volume in the amp.
The sensitivity rating is to give you an idea on how much power they require to achieve a certain volume level, the more sensitive the speaker the less power required to achieve louder volumes.
