I tried out both the Dragonfly and the Blueberry one day at a Guitar Center. Believe it or not, they sounded quite similar. Now, granted, mine was not the most "scientific" of tests. I was simply singing and listening. But they did sound pretty close.
However, it is my understanding that the Dragonfly's primary use is with micing instruments, whereas the Blueberry is more of a vocal mic.
So, to answer your question, I would say "yes"...they should compliment each other very well.
Besides...like I always say...you can never be too rich, too fat or have too many mics!!!