No, the same cast wheel centres are used and the same 3mm diameter pointed end axles but the plated brass rims/tyres are quite different. The S7 tyres are a nice scale profile while the others are quite a bit wider and with deeper flanges. If you try to set the finescale wheels at S7 back to back the insulating bushes and hub protrude beyond the ends of the straight part of the axle so they won't fit between the bearings. Hence the need to push the centres to the back face of the tyres. You might be able to get away with leaving the wide tyre but I haven't tried it.I think the wheel sets only differ in gauge - the tyre profile used being suitable for both FS and S7?