Is there gameplay advantage of adding multiple similar parts to your creature in Spore

In Spore, when adding a new part to your creature you gain the abilities that come with it (e.g. charm level 2, sneak level 1). Naturally, adding a better part (e.g. charm level 4) or replacing the older one gives you better ability.

Adding multiple similar health parts does seem to increase your total health for each part added. But is there some similar gameplay advantage when adding others kinds of parts multiple times?

(Of course, much of Spore's attraction is in creating a creature that suits your tastes, so of course there's often a point in adding multiple similar parts. What I'm asking is if there's also a gameplay advantage.)