Absolutely legions apart really. The RZ harks back to the early 80's and is a fantastic bike in it's own right, but it will be blitzed by an NSR on any road with twists in it.

I owned an RD350 (UK version with steel frame) for a while and loved every minute of it, but in comparison it is like a club compared to a scalpel NSR.

The RZ has more power and midrange if tuned properly, but then it's 100cc bigger. The NSR has lightness and proper sized wheels!

The RD is a road bike, the NSR a race bike.
_________________
MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball