I think it uses the same sensor, but the graduations on the "meter" seem a bit more precise.
Just had my 1,200 mile service. Don't think they even test drove it as it had 1 mile more on it than when I dropped it off (prolly accounts for parking lot driving to bay, wash, etc.). Oil via I-Drive indicates oil at the top mark.
Tim (apparently likes "3" cars)
E90 M3 -- Current ride
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold