Hi Ross,
to my knowledge there is no real difference. Pretty much the same. I'll look it up and post it later in more detail.
To get the pipe off you need to drive the car on two ramps or jack it up in the front. The connection to the righthand side requires a ratchet with socket and a wrench(12mm and 13mm either way) the left hand connection to the exhaust header a ratchet, a long extension and if I remember correctly a 13mm socket. Fortunately there is no nut on top, so its easy to remove and reinstall. You dont have to take the exhaust headers off, just the pipe on the left and a heatshield on the right and there'll be enough room for the mounts to come out.

Your vibration can have a number of causes, one of which can be the driveshaft support bearing, hard to say without looking at and testdriving the car. The others are:
steering dampner, incorrectly balanced front wheels, unsuitable tires, worn out ball joints, tierod joints, worn front shocks, worn rear control arm bushings/joints(if the car seems to handle a bit queer) perhaps engine and tranny mounts or something as trivial as loose bolts somewhere in the front suspension.
Where do you feel the vibration? Does the whole car vibrate or just the steering wheel? If you feel it in the steering wheel the culprit is likely to be found somewhere up front with steering or supension components.
I need a bit more info on your car to eliminate issues. Mileage?
Any suspension parts replaced recently? ect.
Do a visual inspection of the balljoints, swaybar bushings and tierods. Look for torn rubber. Check the front and rear wheels for play. Leakage on the steering dampner? etc.
Hope this helps.
F.J.

__________________
F.J.
81 300 SD grey/palomino 168K miles
84 190E 2.3 black/grey 64K miles (wrecked)
85 190E 2.3 maroon/palomino 92K miles
88 300E desert red/palomino 204k miles
(made to look like a '94-95)
92 400E desert taupe/creme beige 120K miles
(converted to 94-95 E420 looks)