Yeah but, no but... They'll work, but the speedo won't. The 1100S drives its speedo from the gearbox but your GS drives its speedo from a spiggot on the front wheel hub.
The rear wheel will fit ok, but you may need to space it or the ABS ring to line things up. For a front wheel, you need to look out for one from an 1150R/RS/RT or go the 3-spoke route & use one from an 1100R/RS/RT but you will also need the brake discs for this option.
HTH,