The sports suspension (standard on the sport) is 20mm lower than the standard A5 setup.
On the S-line it comes as standard with the sports suspension OR you could upspec to the optional S-line suspension (free I think, but you had to spec it) which was 30mm lower than standard.
Most S-line's have the standard -20mm.
You can check on your production label in the boot, 1BE is -20mm, 1BV is -30mm.
Other changes on the sport/s-line are as mentioned above. Mainly aesthetic,its the S-line bumpers and side blades and the roof liner colour.