Yeah should be the same except a slightler different piston size

Do you know that for certain please?
Cant get a S12 cylinder and need one to put on the car.

If you do a search it was discussed about the S13 one giving a slightly lighter pedal feel, and pukkasilvia found somewhere to buy the s12 one from in the same thread

Thanks buddy, not to concerned about pedal feel just wanted to know the mounts are in same place.