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Hi, there is no programming needed but you can reset the adaptions of the transmission control unit with a Mercedes scan tool. The control unit is adapted to the old transmission. When installed in the new transmission it may not shift properly until you reset the adaptions.
It should not be any different. It sounds like the used transmission may have some issues. Make sure your fluid level is correct and continue to drive the car. It may adapt if you put some more miles on it.
If you drive it the TCU will try to adapt the shifts. If it doesn't adapt I'd say your used transmission is faulty.
Just checking in. Did the shifting improve on your road test?