Both are great balls, but your surface prep and pin to PAP will make each ball very different if you want.
For example, my RZ is pin above and very shiny so I can play further outside. But my Blast Zone has no polish and an earlier rolling layout to allow me to play the wetter part of the lane. I have polished the Blast to increase the late lane movement and it's very good that way, too.
If both were laid out similar and both had the same surface, I would guess that Bracket Creep's assessment would be exactly what I'd see, too.
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah