1150 adventure shocks are longer than stock GS items - will raise the ride height of a GS by about 35mm, or alternatively lower an adventure by the same amount - depends which way round the retro fit is.
Some reckon there is an issue with the angle of the shaft drive if fitting the adv. shocks to a GS, can't see it myself but stand to be corrected.
Can't comment on the 1100 bits.
What is it you're trying to do or achieve ??