No, a blaze bridge sounds a lot like a Steve's special - it's an entirely differrent pickup than the Evo (and predates the evo by rather a while) that just happens to be designed for the same guy.
The Evo7's did strike me as sounding quite close to the 6's, although you have to keep in mind you're probably used to hearing them in alder, not basswood (as an aside, they own in mahogany).
If you like Vai's recent tone, a lot of that is from an evolution. His PAW tone, on the other hand, would probably be best served by a Blaze.
For me, the Blaze bridge is probably the best "standard" seven string pickup, in that as a good 90% of seven string music I've heard was recorded on a blaze in basswood, it's the sound I ususally associate with a seven. That's not to say it's the BEST seven string pickup for all applications, but just that odds are most of the seven string tones you've heard came from one, so it's the sound I associate with a seven. Food for thought.
(and kenny does get some great tones out of the Evo7, by the way

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-D