Sub frame are the same yes but what jet r31 is commenting on is the axles, s1 auto and s2 auto stages have relatively week axles given the weight of the car so if you start making decent power through them with hard launches and shifts they will snap. an auto will cushion them a bit but they will go as will s14 axles ect . So if you where to do this conversion for a serious mod not just the fact of fitting big wheels under it would pay to use a rs260 or rs4s rear sub and diff axle set up and gain much stronger/thicker 6bolt 33gtr axles that run in those cars , and as RS2000 is all ready running in the high 200kw range sure he will need it one day ,
And as jetr31 and mike have said I can not possibly see how 10.5 inch rims with that offset are not fowling rear coils , and make sure ya spring rate is not hard, when I had my 20s on the ride was bone breaking