It should be no different, the track width hasnt changed on mine with the same brakes.
Do you have the Sigma rotors as well? cause some people just use the 120y rotors.
In order to use the sigma ge rotors you must have the centres opened up 2 or 3mm to
match the 1200 centre hole. Someone else has done a sylvia front rotors with mazda
rx7 s5 4 spot calipers however the owner knew nothing about it as he didnt do the conv.