Newer transmission also has some electronics to it... so it is best to check
with a MB transmission specialist on which one is better for your car.
Wow... that's alot of horsepower... my USA version had only 155HP.
I am assuming you are getting an used transmission... it is a gamble... look
at the odometer and see what mileage it has... if it is high as in 300,000
km... then it is reasonable to think that transmission maybe on its last leg
if the body is intact... no accident.
If the car been in accident and has higher mileage... like 400,000 km...
then it is possible the transmission is already rebuilt.
If you are getting the transmission dirt cheap, then it might be worth the
gamble... I think most salvage yard gives you some warranty that it works.
Also smell the transmission fluid, if it is burnt and dark, you know it is