Don't get me wrong- they both smell like DIESEL exhaust, and on that point I agree with Dan. But there is a sort of "added stench" to Detroit Diesel 2-stroke exhaust :-p
I agree it will be "less intense." But a modern 24-valve Cummins in a Dodge Ram is orders of magnitude less intense than the stink of a 1990 Mercedes, but its still instantly recognizable as "diesel" and a lot of people find that smell unpleasant, no matter how faint.
I disagree that lead compounds in exhaust gasses are odorless. I can INSTANTLY tell when a car at a racetrack is running either leaded racing fuel or aviation fuel- its a characteristic "sweet" (for lack of a better term- its certainly not 'sugary') smell. Or go to an air-show and smell the exhaust from a B-17 or P-51, its the same smell only even stronger. And my 60s cars that I drive routinely don't have a strong exhaust odor on today's unleaded fuel, except for the 440 Magnum when its cold because the fairly large cam with a rich mixture gives an unburned fuel smell for a few minutes until its fully warm.