Does anybody know if I can transplant an engine from a 1990 300E into a 1989 300SEL without major conversion issues? Would the transmission be interchangable as well?
Thanks for your help.

I’ve decided to edit my post with a little more information to see if I could get an answer.

The donor engine is a 103.983 from a 1990 300E. The recipient is my 1989 300SEL with engine 103.981.
I’m also thinking about swapping, or at least keeping around the transmission from the 1990 300E, a 722.358 for a potential transplant into my 1989 300SEL with trans 722.351

I guess my real question is with the .XXX suffixes on each engine and transmission number as it relates to compatibility. For instance; is the 722.358 transmission irreversibly incompatible with my 300SEL with the 722.351 transmission? Or is it a simple conversion by switching out modulators or something? Additionally, if the transmission was swapped out “as is” would there be a noticeable difference in drivability? I’ve spent the last several hours researching this topic and can’t seem to find my answer. Any help would be greatly appreciated.
Thank You.