1990 300TE with 1989 300TE seat swap

[Benz Mondi]

I just picked up an 89 300TE with leather seats and the the lumbar option for the front seats. I want to install them and all the other leather seats in my MB tex 1990, questions:

1. I'm assuming that the lumbar seats work with the vac pump/central door lock system. Do I need to swap the unit in the 90 with the 89 as well?

2. What is the easy way to take the 2nd row seat backs out?

3. The side bolsters of the leather front seats out of the 89 seem larger than my 1990. Is this possible?

Thanx for the help.