I wouldn't expect the bell housings to line up, not to mention possible issues with the speed sensors, driveshafts, and whatnot. Why switch out for the six speed? YOu have essentially the same first and fifth gears as in the gearbox on the 240 (which iirc is identical gearing to the NA Z).
Anyhow, as always, anything is possible with enough money. I would say with near certainty that it is no simple plug and go. In my opinion, it is a bad idea anyhow. I haven't driven a TTz, so I don't know what drawbacks you have with the stock gearbox. I wouldn't give up my 5spd for a 6spd on my 240. . .
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