No there is not a direct N-carnation of the ROK. The closest would be:
Nblade or N6.1 95 18x20. I never hit with Rok; 93 or 102. But , if I recall from TT
posters; the ROK was low powered and flexible. If you want flexibility then the
Nblade is what you want, although the Nblade is in a 98 sized head, with a
18x20 string pattern. But, the string spacing is more evenly spaced throughout
the head, unlike dense patterns are normally in Wilson racquets. It has good spin
potential. The N6.1 95 18x20; is a good deal more stiffer than the Nblade.
The stings on it are irregularly spaced; more dense at 3&9.