840Ci and 840Ci Sport; what are the differences?

Would somebody be so kind to list the differences between the 840Ci and 840Ci Sport?

Did the Sport replace the 840Ci or were they sold side-by-side?

If they were sold side by side, were there standard items on the sport that you could option on the 'normal' 840Ci?

Was the Sport sold in the US?

Many thanks!

Could just be badge engineering or renaming, but on other models the main differences tended to be

Lower, firmer "sport" suspension, with no self levelling. Possible lower profile tyres and lower overall ride height.
Close ratio manual gearbox, sometimes with an extra cog (e.g. 6 instead of 5 gears)
One models before ASC / DSC, limited slip differential.

One costs a little more to keep running ;>))