Lessons in Brand Identity - Energizer and Duracell

Studying the logos of Duracell and Energizer, the first impression one gets is that how similar these two logos are. Whats more interesting in the study of these two brands is that they represent two similar products. Their marketing campaigns are similar and they even use similar mascots to represent their brand.

So what kind of marketing is that where you follow your competitors strategy almost religiously? I am sure that if they each try to market themselves in different ways they would both fail to make an impression. However, I have this feeling that using the similar tactics to reach the same markets actually divides the consumers instead of converting them into favor of one. I think the consumers like them both equally and if they don't like either of them then they wouldn't buy the opponent instead they would buy some third brand. 

So what is your take on this matter? Do you think that any of these two can work out a unique and different strategy or you think they should stick to this approach and why? 

Duracell Bunny	Energizer Bunny