Anyone who says they sound identical is buggin' out or you just don't know. Having owned both and the G35 as well. The G is much deeper, while the Z is more whiny. The G resonance is reminiscent of a v8 while the Z sounds distinctly like a v6. I found the gencoupe and G to sound closer together than the Z and G.
I can hear a sub-tone in both that helps me identify the 35 and 37's and Z's as VQ's, but there definately is a difference in depth. Why I don't know? Maybe its the length in exhaust piping. The G is a foot longer.
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